docs/busybox.sgml

<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook V3.1//EN" [...]>
<book id="BusyBoxDocumentation">
 <bookinfo>
  <title>BusyBox - The Swiss Army Knife of Embedded Linux</title>
  
  <legalnotice>
   <para>
     This documentation is free software; you can redistribute
     it and/or modify it under the terms of the GNU General Public
     License as published by the Free Software Foundation; either
     version 2 of the License, or (at your option) any later
     version.
   </para>
      
   <para>
     This program is distributed in the hope that it will be
     useful, but WITHOUT ANY WARRANTY; without even the implied
     warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
     See the GNU General Public License for more details.
   </para>
      
   <para>
     You should have received a copy of the GNU General Public
     License along with this program; if not, write to the Free
     Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
     MA 02111-1307 USA
   </para>
      
   <para>
     For more details see the file COPYING in the source
     distribution of Linux.
   </para>
  </legalnotice>
 </bookinfo>

<toc></toc>
  <chapter id="Introduction">
     <title>Introduction</title>

	<para>
	BusyBox combines tiny versions of many common UNIX utilities into a single
	small executable. It provides minimalist replacements for most of the
	utilities you usually find in fileutils, shellutils, findutils, textutils,
	grep, gzip, tar, etc. BusyBox provides a fairly complete POSIX environment
	for any small or embedded system. The utilities in BusyBox generally have
	fewer options than their full-featured GNU cousins; however, the options
	that are included provide the expected functionality and behave very much
	like their GNU counterparts. 
	</para>

	<para>
	BusyBox has been written with size-optimization and limited resources in
	mind. It is also extremely modular so you can easily include or exclude
	commands (or features) at compile time. This makes it easy to customize
	your embedded systems. To create a working system, just add a kernel, a
	shell (such as ash), and an editor (such as elvis-tiny or ae).
	</para>
  </chapter>

  <chapter id="Syntax">
     <title>How to use BusyBox</title>
	<sect1 id="How to use BusyBox">
	    <title>Syntax</title

	    <para>
	    <screen>
	     BusyBox &lt;function&gt; [arguments...]  # or
	    </screen>
	    </para>

	    <para>
	    <screen>
	     &lt;function&gt; [arguments...]          # if symlinked
	    </screen>
	    </para>
	</sect1>

	<sect1 id="Invoking BusyBox">
	    <para>
	    When you create a link to BusyBox for the function you wish to use, when
	    BusyBox is called using that link it will behave as if the command itself
	    has been invoked.
	    </para>

	    <para>
	    For example, entering
	    </para>

	    <para>
	    <screen>
		    ln -s ./BusyBox ls
		    ./ls
	    </screen>
	    </para>

	    <para>
	    will cause BusyBox to behave as 'ls' (if the 'ls' command has been compiled
	    into BusyBox). 
	    </para>

	    <para>
	    You can also invoke BusyBox by issuing the command as an argument on the
	    command line. For example, entering
	    </para>

	    <para>
	    <screen>
		    ./BusyBox ls
	    </screen>
	    </para>

	    <para>
	    will also cause BusyBox to behave as 'ls'. 
	    </para>

	</sect1>

	<sect1 id="Common options">
	    <para>
	    Most BusyBox commands support the <emphasis>--help</emphasis> option to provide 
	    a terse runtime description of their behavior. 
	    </para>
	</sect1>
  </chapter>

  <chapter id="Commands">
     <title>BusyBox Commands</title>
	<sect1 id="Available BusyBox Commands">
	    <title>Available BusyBox Commands</title>
		<para>
		Currently defined functions include:
		</para>

		<para>
		ar, basename, cat, chgrp, chmod, chown, chroot, chvt, clear, cp, cut, date,
		dc, dd, deallocvt, df, dirname, dmesg, du, dutmp, echo, false, fbset,
		fdflush, find, free, freeramdisk, fsck.minix, grep, gunzip, gzip, halt,
		head, hostid, hostname, id, init, insmod, kill, killall, length, ln,
		loadacm, loadfont, loadkmap, logger, logname, ls, lsmod, makedevs, mkdir,
		mkfifo, mkfs.minix, mknod, mkswap, mktemp, more, mount, mt, mv, nc,
		nslookup, ping, poweroff, printf, ps, pwd, reboot, rm, rmdir, rmmod, sed,
		setkeycodes, sfdisk, sh, sleep, sort, swapoff, swapon, sync, syslogd, tail,
		tar, tee, telnet, test, touch, tr, true, tty, umount, uname, uniq, update,
		uptime, usleep, uudecode, uuencode, wc, which, whoami, yes, zcat, [
		</para>
	</sect1>

	<sect1 id="ar">
	    <title>ar</title>

		<para>
		Usage: ar [OPTION] archive [FILENAME]...
		</para>

		<para>
		Extract or list files from an ar archive.
		</para>

		<para>
		Options:
		</para>

		<para>
		<screen>
			o	Preserve original dates
			p	Extract to stdout
			t	List
			x	Extract
			v	Verbosely list files processed
		</screen>
		</para>
	</sect1>

	<sect1 id="basename">
	    <title>basename</title>
		<para>
		Usage: basename FILE [SUFFIX]
		</para>

		<para>
		Strip directory path and suffixes from FILE. If specified, also removes
		any trailing SUFFIX.
		</para>

		<para>
		Example:
		</para>

		<para>
		<screen>
			$ basename /usr/local/bin/foo
			foo
			$ basename /usr/local/bin/
			bin
			$ basename /foo/bar.txt .txt
			bar
		</screen>
		</para>
	</sect1>

	<sect1 id="cat">
	    <title>cat</title>

		<para>
		Usage: cat [FILE]...
		</para>

		<para>
		Concatenate <literal>FILE(s)</literal> and prints them to the standard
		output.
		</para>

		<para>
		Example:
		</para>

		<para>
		<screen>
			$ cat /proc/uptime
			110716.72 17.67
		</screen>
		</para>
	</sect1>

	<sect1 id="chgrp">
	    <title>chgrp</title>

		<para>
		Usage: chgrp [OPTION]... GROUP FILE...
		</para>

		<para>
		Change the group membership of each FILE to GROUP.
		</para>

		<para>
		Options:
		</para>

		<para>
		<screen>
			-R      Change files and directories recursively
		</screen>
		</para>

		<para>
		Example:
		</para>

		<para>
		<screen>
			$ ls -l /tmp/foo
			-r--r--r--    1 andersen andersen        0 Apr 12 18:25 /tmp/foo
			$ chgrp root /tmp/foo
			$ ls -l /tmp/foo
			-r--r--r--    1 andersen root            0 Apr 12 18:25 /tmp/foo
		</screen>
		</para>
	</sect1>

	<sect1 id="chmod">
	    <title>chmod</title>

		<para>
		Usage: chmod [<emphasis>-R</emphasis>] MODE[,MODE]... FILE...
		</para>

		<para>
		Change file access permissions for the specified
		<literal>FILE(s)</literal> (or directories). Each MODE is defined by
		combining the letters for WHO has access to the file, an OPERATOR for
		selecting how the permissions should be changed, and a PERMISSION for
		<literal>FILE(s)</literal> (or directories).
		</para>

		<para>
		WHO may be chosen from
		</para>

		<para>
		<screen>
			u       User who owns the file
			g       Users in the file's Group
			o       Other users not in the file's group
			a       All users
		</screen>
		</para>

		<para>
		OPERATOR may be chosen from
		</para>

		<para>
		<screen>
			+       Add a permission
			-       Remove a permission
			=       Assign a permission
		</screen>
		</para>

		<para>
		PERMISSION may be chosen from
		</para>

		<para>
		<screen>
			r       Read
			w       Write
			x       Execute (or access for directories)
			s       Set user (or group) ID bit
			t       Sticky bit (for directories prevents removing files by non-owners)
		</screen>
		</para>

		<para>
		Alternately, permissions can be set numerically where the first three
		numbers are calculated by adding the octal values, such as
		</para>

		<para>
		<screen>
			4       Read
			2       Write
			1       Execute
		</screen>
		</para>

		<para>
		An optional fourth digit can also be used to specify
		</para>

		<para>
		<screen>
			4       Set user ID
			2       Set group ID
			1       Sticky bit
		</screen>
		</para>

		<para>
		Options:
		</para>

		<para>
		<screen>
			-R      Change files and directories recursively.
		</screen>
		</para>

		<para>
		Example:
		</para>

		<para>
		<screen>
			$ ls -l /tmp/foo
			-rw-rw-r--    1 root     root            0 Apr 12 18:25 /tmp/foo
			$ chmod u+x /tmp/foo
			$ ls -l /tmp/foo
			-rwxrw-r--    1 root     root            0 Apr 12 18:25 /tmp/foo*
			$ chmod 444 /tmp/foo
			$ ls -l /tmp/foo
			-r--r--r--    1 root     root            0 Apr 12 18:25 /tmp/foo
		</screen>
		</para>
	</sect1>
	
	<sect1 id="chown">
	    <title>chown</title>
		<para>
		Usage: chown [OPTION]... OWNER[&lt;.|:&gt;[GROUP] FILE...
		</para>

		<para>
		Change the owner and/or group of each FILE to OWNER and/or GROUP.
		</para>

		<para>
		Options:
		</para>

		<para>
		<screen>
			-R      Change files and directories recursively
		</screen>
		</para>

		<para>
		Example:
		</para>

		<para>
		<screen>
			$ ls -l /tmp/foo
			-r--r--r--    1 andersen andersen        0 Apr 12 18:25 /tmp/foo
			$ chown root /tmp/foo
			$ ls -l /tmp/foo
			-r--r--r--    1 root     andersen        0 Apr 12 18:25 /tmp/foo
			$ chown root.root /tmp/foo
			ls -l /tmp/foo
			-r--r--r--    1 root     root            0 Apr 12 18:25 /tmp/foo
		</screen>
		</para>
	</sect1>

	<sect1 id="chroot">
	    <title>chroot</title>
		<para>
		Usage: chroot NEWROOT [COMMAND...]
		</para>

		<para>
		Run COMMAND with root directory set to NEWROOT.
		</para>

		<para>
		Example:
		</para>

		<para>
		<screen>
			$ ls -l /bin/ls
			lrwxrwxrwx    1 root     root          12 Apr 13 00:46 /bin/ls -&gt; /BusyBox
			$ mount /dev/hdc1 /mnt -t minix
			$ chroot /mnt
			$ ls -l /bin/ls
			-rwxr-xr-x    1 root     root        40816 Feb  5 07:45 /bin/ls*
		</screen>
		</para>
	</sect1>

	<sect1 id="chvt">
	    <title>chvt</title>
		<para>
		Usage: chvt N
		</para>

		<para>
		Change the foreground virtual terminal to /dev/ttyN
		</para>
	</sect1>

	<sect1 id="clear">
	    <title>clear</title>

		<para>
		Usage: clear
		</para>

		<para>
		Clear the screen.
		</para>
	</sect1>

	<sect1 id="cp">
	    <title>cp</title>

		<para>
		Usage: cp [OPTION]... SOURCE DEST
		</para>

		<para>
		<screen>
		   or: cp [OPTION]... SOURCE... DIRECTORY
		</screen>
		</para>

		<para>
		Copy SOURCE to DEST, or multiple <literal>SOURCE(s)</literal> to
		DIRECTORY.
		</para>

		<para>
		Options:
		</para>

		<para>
		<screen>
			-a      Same as -dpR
			-d      Preserve links
			-p      Preserve file attributes if possible
			-R      Copy directories recursively
		</screen>
		</para>
	</sect1>

	<sect1 id="cut">
	    <title>cut</title>

		<para>
		Usage: cut [OPTION]... [FILE]...
		</para>

		<para>
		Print selected fields from each input FILE to standard output.
		</para>

		<para>
		Options:
		</para>

		<para>
		<screen>
				-b LIST Output only bytes from LIST
				-c LIST Output only characters from LIST
				-d CHAR Use CHAR instead of tab as the field delimiter
				-s      Only output Lines if the include DELIM
				-f N    Print only these fields
				-n      Ignored
		</screen>
		</para>

		<para>
		Example:
		</para>

		<para>
		<screen>
			$ echo "Hello world" | cut -f 1 -d ' '
			Hello
			$ echo "Hello world" | cut -f 2 -d ' '
			world
		</screen>
		</para>
	</sect1>

	<sect1 id="date">
	    <title>date</title>

		<para>
		Usage: date [OPTION]... [+FORMAT]
		</para>

		<para>
		<screen>
		  or:  date [OPTION] [MMDDhhmm[[CC]YY][.ss]]
		</screen>
		</para>

		<para>
		Display the current time in the given FORMAT, or set the system date.
		</para>

		<para>
		Options:
		</para>

		<para>
		<screen>
			-R      Output RFC-822 compliant date string
			-s      Set time described by STRING
			-u      Print or set Coordinated Universal Time
		</screen>
		</para>

		<para>
		Example:
		</para>

		<para>
		<screen>
			$ date
			Wed Apr 12 18:52:41 MDT 2000
		</screen>
		</para>
	</sect1>

	<sect1 id="dc">
	    <title>dc</title>

		<para>
		Usage: dc [EXPRESSION]
		</para>

		<para>
		This is a Tiny RPN calculator that understands the
		following operations: +, -, /, *, and, or, not, eor. If
		no arguments are given, dc will process input from
		stdin.
		</para>

		<para>
		The behaviour of BusyBox/dc deviates (just a little ;-)
		from GNU/dc, but this will be remedied in the future.
		</para>

		<para>
		Example:
		</para>

		<para>
		<screen>
			$ dc 2 2 +
			4
			$ dc 8 8 \* 2 2 + /
			16
			$ dc 0 1 and
			0
			$ dc 0 1 or
			1
			$ echo 72 9 div 8 mul | dc
			64
		</screen>
		</para>
	</sect1>

	<sect1 id="dd">
	    <title>dd</title>

		<para>
		Usage: dd [OPTION]...
		</para>

		<para>
		Copy a file, converting and formatting according to
		options.
		</para>

		<para>
		Options:
		</para>

		<para>
		<screen>
			if=FILE Read from FILE instead of stdin
			of=FILE Write to FILE instead of stdout
			bs=N    Read and write N bytes at a time
			count=N Copy only N input blocks
			skip=N  Skip N input blocks
			seek=N  Skip N output blocks
		</screen>
		</para>

		<para>
		Numbers may be suffixed by w (x2), k (x1024), b (x512),
		or M (x1024^2).
		</para>

		<para>
		Example:
		</para>

		<para>
		<screen>
			$ dd if=/dev/zero of=/dev/ram1 bs=1M count=4
			4+0 records in
			4+0 records out
		</screen>
		</para>
	</sect1>

	<sect1 id="deallocvt">
	    <title>deallocvt</title>

		<para>
		Usage: deallocvt N
		</para>

		<para>
		Deallocate unused virtual terminal /dev/ttyN.
		</para>
	</sect1>

	<sect1 id="df">
	    <title>df</title>

		<para>
		Usage: df [FILE]...
		</para>

		<para>
		Print the filesystem space used and space available.
		</para>

		<para>
		Example:
		</para>

		<para>
		<screen>
			$ df
			Filesystem           1k-blocks      Used Available Use% Mounted on
			/dev/sda3              8690864   8553540    137324  98% /
			/dev/sda1                64216     36364     27852  57% /boot
			$ df /dev/sda3
			Filesystem           1k-blocks      Used Available Use% Mounted on
			/dev/sda3              8690864   8553540    137324  98% /
		</screen>
		</para>
	</sect1>
	
	<sect1 id="dirname">
	    <title>dirname</title>

		<para>
		Usage: dirname NAME
		</para>

		<para>
		Strip non-directory suffix from NAME.
		</para>

		<para>
		Example:
		</para>

		<para>
		<screen>
			$ dirname /tmp/foo
			/tmp
			$ dirname /tmp/foo/
			/tmp
		</screen>
		</para>
	</sect1>

	<sect1 id="dmesg">
	    <title>dmesg</title>

		<para>
		Usage: dmesg [OPTION]...
		</para>

		<para>
		Print or control the kernel ring buffer.
		</para>

		<para>
		Options:
		</para>

		<para>
		<screen>
			-c		Clear the ring buffer after printing
			-n LEVEL	Set the console logging level to LEVEL
			-s BUFSIZE	Query ring buffer using a buffer of BUFSIZE
		</screen>
		</para>
	</sect1>

	<sect1 id="du">
	    <title>du</title>

		<para>
		Usage: du [OPTION]... [FILE]...
		</para>

		<para>
		Summarize the disk space used for each FILE or current
		directory.  Disk space printed in units of 1k (i.e.
		1024 bytes).
		</para>

		<para>
		Options:
		</para>

		<para>
		<screen>
			-l	Count sizes many times if hard linked
			-s	Display only a total for each argument
		</screen>
		</para>

		<para>
		Example:
		</para>

		<para>
		<screen>
			$ du
			16	./CVS
			12	./kernel-patches/CVS
			80	./kernel-patches
			12	./tests/CVS
			36	./tests
			12	./scripts/CVS
			16	./scripts
			12	./docs/CVS
			104	./docs
			2417	.
		</screen>
		</para>
	</sect1>

	<sect1 id="dutmp">
	    <title>dutmp</title>

		<para>
		Usage: dutmp [FILE]
		</para>

		<para>
		Dump utmp file format (pipe delimited) from FILE or
		stdin to stdout.
		</para>

		<para>
		Example:
		</para>

		<para>
		<screen>
			$ dutmp /var/run/utmp
			8|7||si|||0|0|0|955637625|760097|0
			2|0|~|~~|reboot||0|0|0|955637625|782235|0
			1|20020|~|~~|runlevel||0|0|0|955637625|800089|0
			8|125||l4|||0|0|0|955637629|998367|0
			6|245|tty1|1|LOGIN||0|0|0|955637630|998974|0
			6|246|tty2|2|LOGIN||0|0|0|955637630|999498|0
			7|336|pts/0|vt00andersen|andersen|:0.0|0|0|0|955637763|0|0
		</screen>
		</para>
	</sect1>

	<sect1 id="echo">
	    <title>echo</title>

		<para>
		Usage: echo [OPTION]... [ARG]...
		</para>

		<para>
		Print ARGs to stdout.
		</para>

		<para>
		Options:
		</para>

		<para>
		<screen>
			-n	Suppress trailing newline
			-e	Enable interpretation of escaped characters
			-E	Disable interpretation of escaped characters
		</screen>
		</para>

		<para>
		Example:
		</para>

		<para>
		<screen>
			$ echo "Erik is cool"
			Erik is cool
			$ echo -e "Erik\nis\ncool"
			Erik
			is
			cool
			$ echo "Erik\nis\ncool"
			Erik\nis\ncool
		</screen>
		</para>
	</sect1>

	<sect1 id="false">
	    <title>false</title>

		<para>
		Usage: false
		</para>

		<para>
		Returns an exit code of FALSE (1).
		</para>

		<para>
		Example:
		</para>

		<para>
		<screen>
			$ false
			$ echo $?
			1
		</screen>
		</para>
	</sect1>

	<sect1 id="fbset">
	    <title>fbset</title>

		<para>
		Usage: fbset [OPTION]... [MODE]
		</para>

		<para>
		Show and modify frame buffer device settings.
		</para>

		<para>
		Options:
		</para>

		<para>
		<screen>
			-h						Display option summary
			-fb DEVICE					Operate on DEVICE
			-db FILE					Use FILE for mode database
			-g XRES YRES VXRES VYRES DEPTH			Set all geometry parameters
			-t PIXCLOCK LEFT RIGHT UPPER LOWER HSLEN VSLEN	Set all timing parameters
			-xres RES					Set visible horizontal resolution
			-yres RES					Set visible vertical resolution
		</screen>
		</para>

		<para>
		Example:
		</para>

		<para>
		<screen>
			$ fbset
			mode "1024x768-76"
					# D: 78.653 MHz, H: 59.949 kHz, V: 75.694 Hz
					geometry 1024 768 1024 768 16
					timings 12714 128 32 16 4 128 4
					accel false
					rgba 5/11,6/5,5/0,0/0
			endmode
		</screen>
		</para>
	</sect1>

	<sect1 id="fdflush">
	    <title>fdflush</title>

		<para>
		Usage: fdflush DEVICE
		</para>

		<para>
		Force floppy disk drive to detect disk change on DEVICE.
		</para>
	</sect1>

	<sect1 id="find">
	    <title>find</title>

		<para>
		Usage: find [PATH]... [EXPRESSION]
		</para>

		<para>
		Search for files in a directory hierarchy. The default
		PATH is the current directory; default EXPRESSION is
		'-print'.
		</para>

		<para>
		EXPRESSION may consist of:
		</para>

		<para>
		<screen>
			-follow		Dereference symbolic links
			-name PATTERN	File name (leading directories removed) matches PATTERN
			-print		Print the full file name followed by a newline to stdout
		</screen>
		</para>

		<para>
		Example:
		</para>

		<para>
		<screen>
			$ find / -name /etc/passwd
			/etc/passwd
		</screen>
		</para>
	</sect1>

	<sect1 id="free">
	    <title>free</title>

		<para>
		Usage: free
		</para>

		<para>
		Displays the amount of free and used system memory.
		</para>

		<para>
		Example:
		</para>

		<para>
		<screen>
			$ free
			total         used         free       shared      buffers
			  Mem:       257628       248724         8904        59644        93124
			 Swap:       128516         8404       120112
			Total:       386144       257128       129016
		</screen>
		</para>
	</sect1>

	<sect1 id="freeramdisk">
	    <title>freeramdisk</title>

		<para>
		Usage: freeramdisk DEVICE
		</para>

		<para>
		Free all memory used by the ramdisk DEVICE.
		</para>

		<para>
		Example:
		</para>

		<para>
		<screen>
			$ freeramdisk /dev/ram2
		</screen>
		</para>
	</sect1>

	<sect1 id="fsck.minix">
	    <title>fsck.minix</title>

		<para>
		Usage: fsck.minix [OPTION]... DEVICE
		</para>

		<para>
		Perform a consistency check on the MINIX filesystem on
		DEVICE.
		</para>

		<para>
		Options:
		</para>

		<para>
		<screen>
			-l	List all filenames
			-r	Perform interactive repairs
			-a	Perform automatic repairs
			-v	Verbose
			-s	Output super-block information
			-m	Activate MINIX-like "mode not cleared" warnings
			-f	Force file system check.
		</screen>
		</para>
	</sect1>

	<sect1 id="grep">
	    <title>grep</title>

		<para>
		Usage: grep [OPTIONS]... PATTERN [FILE]...
		</para>

		<para>
		Search for PATTERN in each FILE or stdin.
		</para>

		<para>
		Options:
		</para>

		<para>
		<screen>
			-h	Suppress the prefixing filename on output
			-i	Ignore case distinctions
			-n	Print line number with output lines
			-q	Be quiet. Returns 0 if result was found, 1 otherwise
			-v	Select non-matching lines
		</screen>
		</para>

		<para>
		This version of grep matches full regular expressions.
		</para>

		<para>
		Example:
		</para>

		<para>
		<screen>
			$ grep root /etc/passwd
			root:x:0:0:root:/root:/bin/bash
			$ grep ^[rR]oo. /etc/passwd
			root:x:0:0:root:/root:/bin/bash
		</screen>
		</para>
	</sect1>

	<sect1 id="gunzip">
	    <title>gunzip</title>

		<para>
		Usage: gunzip [OPTION]... FILE
		</para>

		<para>
		Uncompress FILE (or stdin if FILE is '-').
		</para>

		<para>
		Options:
		</para>

		<para>
		<screen>
			-c	Write output to standard output
			-t	Test compressed file integrity
		</screen>
		</para>

		<para>
		Example:
		</para>

		<para>
		<screen>
			$ ls -la /tmp/BusyBox*
			-rw-rw-r--    1 andersen andersen   557009 Apr 11 10:55 /tmp/BusyBox-0.43.tar.gz
			$ gunzip /tmp/BusyBox-0.43.tar.gz
			$ ls -la /tmp/BusyBox*
			-rw-rw-r--    1 andersen andersen  1761280 Apr 14 17:47 /tmp/BusyBox-0.43.tar
		</screen>
		</para>
	</sect1>

<	<sect1 id="gzip">
	    <title>gzip</title>

		<para>
		Usage: gzip [OPTION]... FILE
		</para>

		<para>
		Compress FILE (or stdin if FILE is '-') with maximum
		compression to FILE.gz (or stdout if FILE is '-').
		</para>

		<para>
		Options:
		</para>

		<para>
		<screen>
			-c	Write output to standard output
		</screen>
		</para>

		<para>
		Example:
		</para>

		<para>
		<screen>
			$ ls -la /tmp/BusyBox*
			-rw-rw-r--    1 andersen andersen  1761280 Apr 14 17:47 /tmp/BusyBox-0.43.tar
			$ gzip /tmp/BusyBox-0.43.tar
			$ ls -la /tmp/BusyBox*
			-rw-rw-r--    1 andersen andersen   554058 Apr 14 17:49 /tmp/BusyBox-0.43.tar.gz
		</screen>
		</para>
	</sect1>

	<sect1 id="halt">
	    <title>halt</title>

		<para>
		Usage: halt
		</para>

		<para>
		Halt the system.
		</para>
	</sect1>

	<sect1 id="head">
	    <title>head</title>

		<para>
		Usage: head [OPTION] FILE...
		</para>

		<para>
		Print first 10 lines of each FILE to standard output.
		With more than one FILE, precede each with a header
		giving the file name. With no FILE, or when FILE is -,
		read standard input.
		</para>

		<para>
		Options:
		</para>

		<para>
		<screen>
			-n NUM	Print first NUM lines instead of first 10
		</screen>
		</para>

		<para>
		Example:
		</para>

		<para>
		<screen>
			$ head -n 2 /etc/passwd
			root:x:0:0:root:/root:/bin/bash
			daemon:x:1:1:daemon:/usr/sbin:/bin/sh
		</screen>
		</para>
	</sect1>

	<sect1 id="hostid">
	    <title>hostid</title>

		<para>
		Usage: hostid
		</para>

		<para>
		Prints out a unique 32-bit identifier for the current
		machine. The 32-bit identifier is intended to be unique
		among all UNIX systems in existence. 
		</para>
	</sect1>

	<sect1 id="hostname">
	    <title>hostname</title>

		<para>
		Usage: hostname [OPTION]... [HOSTNAME|-F FILE]
		</para>

		<para>
		Get or set the hostname or DNS domain name. If a
		hostname is given (or a file with the -F parameter), the
		host name will be set.
		</para>

		<para>
		Options:
		</para>

		<para>
		<screen>
			-s	Short
			-i	Addresses for the hostname
			-d	DNS domain name
			-F FILE	Use the contents of FILE to specify the hostname
		</screen>
		</para>

		<para>
		Example:
		</para>

		<para>
		<screen>
			$ hostname
			slag
		</screen>
		</para>
	</sect1>

	<sect1 id="id">
	    <title>id</title>

		<para>
		Usage: id [OPTION]... [USERNAME]
		</para>

		<para>
		Print information for USERNAME or the current user.
		</para>

		<para>
		Options:
		</para>

		<para>
		<screen>
			-g	Print only the group ID
			-u	Print only the user ID
			-r	Print the real user ID instead of the effective ID (with -ug)
		</screen>
		</para>

		<para>
		Example:
		</para>

		<para>
		<screen>
			$ id
			uid=1000(andersen) gid=1000(andersen)
		</screen>
		</para>
	</sect1>

	<sect1 id="init">
	    <title>init</title>

		<para>
		Usage: init
		</para>

		<para>
		Init is the parent of all processes.
		</para>

		<para>
		This version of init is designed to be run only by the
		kernel.
		</para>

		<para>
		BusyBox init doesn't support multiple runlevels. The
		runlevels field of the /etc/inittab file is completely
		ignored by BusyBox init. If you want runlevels, use
		sysvinit.
		</para>

		<para>
		BusyBox init works just fine without an inittab. If no
		inittab is found, it has the following default behavior:
		</para>

		<para>
		<screen>
			::sysinit:/etc/init.d/rcS
			::askfirst:/bin/sh
		</screen>
		</para>

		<para>
		If it detects that /dev/console is _not_ a serial
		console, it will also run:
		</para>

		<para>
		<screen>
			tty2::askfirst:/bin/sh
		</screen>
		</para>

		<para>
		If you choose to use an /etc/inittab file, the inittab
		entry format is as follows:
		</para>

		<para>
		<screen>
			&lt;id&gt;:&lt;runlevels&gt;:&lt;action&gt;:&lt;process&gt;
		</screen>
		<para>

		<sect2>
		    <title>id</title>
			<para>
                	WARNING: This field has a non-traditional
			meaning for BusyBox init!  The id field is used
			by BusyBox init to specify the controlling tty
			for the specified process to run on.  The
			contents of this field are appended to "/dev/"
			and used as-is.  There is no need for this field
			to be unique, although if it isn't you may have
			strange results.  If this field is left blank,
			it is completely ignored.  Also note that if
			BusyBox detects that a serial console is in use,
			then all entries containing non-empty id fields
			will _not_ be run.  BusyBox init does nothing
			with utmp.  We don't need no stinkin' utmp.
			</para>
		</sect2>

		<sect2>
		    <title>runlevels</title>

			<para>
                	The runlevels field is completely ignored.
			</para>
		</sect2>

		<sect2>
		    <title>action</title>

			<para>
                	Valid actions include: sysinit, respawn,
			askfirst, wait, once, and ctrlaltdel.
			</para>

			<para>
                	askfirst acts just like respawn, but before
			running the specified process it displays the
			line "Please press Enter to activate this
			console." and then waits for the user to press
			enter before starting the specified process.
			</para>

			<para>
                	Unrecognized actions (like initdefault) will
			cause init to emit an error message, and then go
			along with its business.
			</para>
		</sect2>

		<sect2>
		    <title>process</title>

			<para>
                	Specifies the process to be executed and its
			command line.
			</para>
		</sect2>

		<para>
		Example /etc/inittab file:
		</para>

		<para>
		<screen>
			# This is run first except when booting in single-user mode.
			#
			::sysinit:/etc/init.d/rcS

			# /bin/sh invocations on selected ttys
			#
			# Start an "askfirst" shell on the console (whatever that may be)
			::askfirst:/bin/sh
			# Start an "askfirst" shell on /dev/tty2
			tty2::askfirst:/bin/sh

			# /sbin/getty invocations for selected ttys
			#
			tty4::respawn:/sbin/getty 38400 tty4
			tty5::respawn:/sbin/getty 38400 tty5

			# Example of how to put a getty on a serial line (for a terminal)
			#
			#ttyS0::respawn:/sbin/getty -L ttyS0 9600 vt100
			#ttyS1::respawn:/sbin/getty -L ttyS1 9600 vt100
			#
			# Example how to put a getty on a modem line.
			#ttyS2::respawn:/sbin/getty -x0 -s 57600 ttyS2

			# Stuff to do before rebooting
			::ctrlaltdel:/bin/umount -a -r &gt; /dev/null 2&gt;&amp;1
			::ctrlaltdel:/sbin/swapoff -a &gt; /dev/null 2&gt;&amp;1
		</screen>
		</para>
	</sect1>

	<sect1 id="insmod">
	    <title>insmod</title>

		<para>
		Usage: insmod [OPTION]... MODULE [symbol=value]...
		</para>

		<para>
		Loads MODULE into the kernel.
		</para>

		<para>
		Options:
		</para>

		<para>
		<screen>
			-f	Force module to load into the wrong kernel version.
			-k	Make module autoclean-able.
			-v	Verbose output
			-x	Do not export externs
		</screen>
		</para>
	</sect1>

	<sect1 id="kill">
	    <title>kill</title>

		<para>
		Usage: kill [OPTION] PID...
		</para>

		<para>
		Send a signal (default is SIGTERM) to the specified
		PID(s).
		</para>

		<para>
		Options:
		</para>

		<para>
		<screen>
			-l	List all signal names and numbers
			-SIG	Send signal SIG
		</screen>
		</para>

		<para>
		Example:
		</para>

		<para>
		<screen>
			$ ps | grep apache
			252 root     root     S [apache]
			263 www-data www-data S [apache]
			264 www-data www-data S [apache]
			265 www-data www-data S [apache]
			266 www-data www-data S [apache]
			267 www-data www-data S [apache]
			$ kill 252
		</screen>
		</para>
	</sect1>

	<sect1 id="killall">
	    <title>killall</title>

		<para>
		Usage: killall [OPTION] NAME...
		</para>

		<para>
		Send a signal (default is SIGTERM) to the specified
		NAME(s).
		</para>

		<para>
		Options:
		</para>

		<para>
		<screen>
			-l	List all signal names and numbers
			-SIG	Send signal SIG
		</screen>
		</para>

		<para>
		Example:
		</para>

		<para>
		<screen>
			$ killall apache
		</screen>
		</para>
	</sect1>

	<sect1 id="length">
	    <title>length</title>

		<para>
		Usage: length STRING
		</para>

		<para>
		Print the length of STRING.
		</para>

		<para>
		Example:
		</para>

		<para>
		<screen>
			$ length "Hello"
			5
		</screen>
		</para>
	</sect1>

	<sect1 id="ln">
	    <title>ln</title>

		<para>
		Usage: ln [OPTION]... TARGET FILE|DIRECTORY
		</para>

		<para>
		Create a link named FILE or DIRECTORY to the specified
		TARGET.  You may use '--' to indicate that all following
		arguments are non-options.
		</para>

		<para>
		Options:
		</para>

		<para>
		<screen>
			-s	Make symbolic link instead of hard link
			-f	Remove existing destination file
		</screen>
		</para>

		<para>
		Example:
		</para>

		<para>
		<screen>
			$ ln -s BusyBox /tmp/ls
			$ ls -l /tmp/ls
			lrwxrwxrwx    1 root     root            7 Apr 12 18:39 ls -&gt; BusyBox*
		</screen>
		</para>
	</sect1>

	<sect1 id="loadacm">
	    <title>loadacm</title>

		<para>
		Usage: loadacm
		</para>

		<para>
		Load an acm from stdin.
		</para>

		<para>
		Example:
		</para>

		<para>
		<screen>
			$ loadacm &lt; /etc/i18n/acmname
		</screen>
		</para>
	</sect1>

	<sect1 id="loadfont">
	    <title>loadfont</title>

		<para>
		Usage: loadfont
		</para>

		<para>
		Load a console font from stdin.
		</para>

		<para>
		Example:
		</para>

		<para>
		<screen>
			$ loadfont &lt; /etc/i18n/fontname
		</screen>
		</para>
	</sect1>

	<sect1 id="loadkmap">
	    <title>loadkmap</title>

		<para>
		Usage: loadkmap
		</para>

		<para>
		Load a binary keyboard translation table from stdin.
		</para>

		<para>
		Example:
		</para>

		<para>
		<screen>
			$ loadkmap &lt; /etc/i18n/lang-keymap
		</screen>
		</para>
	</sect1>

	<sect1 id="logger">
	    <title>logger</title>

		<para>
		Usage: logger [OPTION]... [MESSAGE]
		</para>

		<para>
		Write MESSAGE to the system log.  If MESSAGE is '-', log
		stdin.
		</para>

		<para>
		Options:
		</para>

		<para>
		<screen>
			-s	Log to stderr as well as the system log
			-t	Log using the specified tag (defaults to user name)
			-p	Enter the message with the specified priority
				This may be numerical or a ``facility.level'' pair
		</screen>
		</para>

		<para>
		Example:
		</para>

		<para>
		<screen>
			$ logger "hello"
		</screen>
		</para>
	</sect1>

	<sect1 id="logname">
	    <title>logname</title>

		<para>
		Usage: logname
		</para>

		<para>
		Print the name of the current user.
		</para>

		<para>
		Example:
		</para>

		<para>
		<screen>
			$ logname
			root
		</screen>
		</para>
	</sect1>

	<sect1 id="ls">
	    <title>ls</title>

		<para>
		Usage: ls [OPTION]... [FILE]...
		</para>

		<para>
		
		</para>

		<para>
		Options:
		</para>

		<para>
		<screen>
			-a	Do not hide entries starting with .
			-c	With  -l:  show ctime (the time of last
				modification of file status information)
			-d	List directory entries instead of contents
			-e	List both full date and full time
			-l	Use a long listing format
			-n	List numeric UIDs and GIDs instead of names
			-p	Append indicator (one of /=@|) to entries
			-u	With -l: show access time (the time of last
				access of the file)
			-x	List entries by lines instead of by columns
			-A	Do not list implied . and ..
			-C	List entries by columns
			-F	Append indicator (one of */=@|) to entries
			-R	List subdirectories recursively
		</screen>
		</para>

		<para>
		Example:
		</para>

		<para>
		<screen>
		</screen>
		</para>
	</sect1>

	<sect1 id="lsmod">
	    <title>lsmod</title>

		<para>
		Usage: lsmod
		</para>

		<para>
		List currently loaded kernel modules.
		</para>
	</sect1>

	<sect1 id="makedevs">
	    <title>makedevs</title>

		<para>
		Usage: makedevsf NAME TYPE MAJOR MINOR FIRST LAST [s]
		</para>

		<para>
		Create a range of block or character special files.
		</para>

		<para>
		TYPE may be:
		</para>

		<para>
		<screen>
			b	Make a block (buffered) device
			c or u	Make a character (un-buffered) device
			p	Make a named pipe. MAJOR and MINOR are ignored for named pipes
		</screen>
		</para>

		<para>
		FIRST specifies the number appended to NAME to create
		the first device.  LAST specifies the number of the last
		item that should be created. If 's' is the last
		argument, the base device is created as well.
		</para>

		<para>
		Example:
		</para>

		<para>
		<screen>
			$ makedevs /dev/ttyS c 4 66 2 63
			[creates ttyS2-ttyS63]
			$ makedevs /dev/hda b 3 0 0 8 s
			[creates hda,hda1-hda8]
		</screen>
		</para>
	</sect1>

<!-- This is where I have stopped formatting stuff -->
<varlistentry><term><emphasis>md5sum

</emphasis></term>
<listitem><para></para>

<para>
Usage: md5sum [OPTION] [file ...]


</para>

<para>
Print or check MD5 checksums.


</para>

<para>
Options:


</para>

<para>
<screen>
        -b       read files in binary mode
        -c       check MD5 sums against given list
        -t       read files in text mode (default)
        -g       read a string
</screen>


</para>

<para>
The following two options are useful only when verifying checksums:


</para>

<para>
<screen>
        -s       don't output anything, status code shows success
        -w       warn about improperly formated MD5 checksum lines
</screen>


</para>

<para>
Example:


</para>

<para>
<screen>
        $ md5sum busybox
        6fd11e98b98a58f64ff3398d7b324003  busybox
        $ md5sum -c -
        6fd11e98b98a58f64ff3398d7b324003  busybox
        busybox: OK
        ^D
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>mkdir

</emphasis></term>
<listitem><para></para>

<para>
Usage: mkdir [OPTION] DIRECTORY...


</para>

<para>
Create the <literal>DIRECTORY(ies),</literal> if they do not already exist


</para>

<para>
Options:


</para>

<para>
<screen>
        -m      set permission mode (as in chmod), not rwxrwxrwx - umask
        -p      no error if directory exists, make parent directories as needed
</screen>


</para>

<para>
Example:


</para>

<para>
<screen>
        $ mkdir /tmp/foo
        $ mkdir /tmp/foo
        /tmp/foo: File exists
        $ mkdir /tmp/foo/bar/baz
        /tmp/foo/bar/baz: No such file or directory
        $ mkdir -p /tmp/foo/bar/baz
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>mkfifo

</emphasis></term>
<listitem><para></para>

<para>
Usage: mkfifo [OPTIONS] name


</para>

<para>
Creates a named pipe (identical to 'mknod name p')


</para>

<para>
Options:


</para>

<para>
<screen>
        -m      create the pipe using the specified mode (default a=rw)
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>mkfs.minix

</emphasis></term>
<listitem><para></para>

<para>
Usage: mkfs.minix [<emphasis>-c</emphasis> | <emphasis>-l</emphasis> filename] [<emphasis>-nXX</emphasis>] [<emphasis>-iXX</emphasis>] /dev/name [blocks]


</para>

<para>
Make a MINIX filesystem.


</para>

<para>
OPTIONS:


</para>

<para>
<screen>
        -c              Check the device for bad blocks
        -n [14|30]      Specify the maximum length of filenames
        -i              Specify the number of inodes for the filesystem
        -l FILENAME     Read the bad blocks list from FILENAME
        -v              Make a Minix version 2 filesystem
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>mknod

</emphasis></term>
<listitem><para></para>

<para>
Usage: mknod [OPTIONS] NAME TYPE MAJOR MINOR


</para>

<para>
Create a special file (block, character, or pipe).


</para>

<para>
Options:


</para>

<para>
<screen>
        -m      create the special file using the specified mode (default a=rw)
</screen>


</para>

<para>
TYPEs include: b: Make a block (buffered) device. c or u: Make a character
(un-buffered) device. p: Make a named pipe. MAJOR and MINOR are ignored for
named pipes.


</para>

<para>
Example:


</para>

<para>
<screen>
        $ mknod /dev/fd0 b 2 0 
        $ mknod -m 644 /tmp/pipe p
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>mkswap

</emphasis></term>
<listitem><para></para>

<para>
Usage: mkswap [<emphasis>-c</emphasis>] [<emphasis>-v0</emphasis>|<emphasis>-v1</emphasis>] device [block-count]


</para>

<para>
Prepare a disk partition to be used as a swap partition.


</para>

<para>
Options:


</para>

<para>
<screen>
        -c              Check for read-ability.
        -v0             Make version 0 swap [max 128 Megs].
        -v1             Make version 1 swap [big!] (default for kernels &gt; 2.1.117).
        block-count     Number of block to use (default is entire partition).
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>mktemp

</emphasis></term>
<listitem><para></para>

<para>
Usage: mktemp [<emphasis>-q</emphasis>] TEMPLATE


</para>

<para>
Creates a temporary file with its name based on TEMPLATE. TEMPLATE is any
name with six `Xs' (i.e. /tmp/temp.XXXXXX).


</para>

<para>
Example:


</para>

<para>
<screen>
        $ mktemp /tmp/temp.XXXXXX
        /tmp/temp.mWiLjM
        $ ls -la /tmp/temp.mWiLjM
        -rw-------    1 andersen andersen        0 Apr 25 17:10 /tmp/temp.mWiLjM
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>more

</emphasis></term>
<listitem><para></para>

<para>
Usage: more [file ...]


</para>

<para>
More is a filter for paging through text one screenful at a time.


</para>

<para>
Example:


</para>

<para>
<screen>
        $ dmesg | more
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>mount

</emphasis></term>
<listitem><para></para>

<para>
Usage: mount [flags] mount [flags] device directory [<emphasis>-o</emphasis> options,more-options]


</para>

<para>
Flags:


</para>

<para>
<screen>
        -a:             Mount all file systems in fstab.
        -o option:      One of many filesystem options, listed below.
        -r:             Mount the filesystem read-only.
        -t fs-type:     Specify the filesystem type.
        -w:             Mount for reading and writing (default).
</screen>


</para>

<para>
Options for use with the ``<emphasis>-o</emphasis>'' flag:


</para>

<para>
<screen>
        async/sync:     Writes are asynchronous / synchronous.
        atime/noatime:  Enable / disable updates to inode access times.
        dev/nodev:      Allow use of special device files / disallow them.
        exec/noexec:    Allow use of executable files / disallow them.
        loop:           Mounts a file via loop device.
        suid/nosuid:    Allow set-user-id-root programs / disallow them.
        remount:        Re-mount a currently-mounted filesystem, changing its flags.
        ro/rw:          Mount for read-only / read-write.
        There are EVEN MORE flags that are specific to each filesystem.
        You'll have to see the written documentation for those.
</screen>


</para>

<para>
Example:


</para>

<para>
<screen>
        $ mount
        /dev/hda3 on / type minix (rw)
        proc on /proc type proc (rw)
        devpts on /dev/pts type devpts (rw)
        $ mount /dev/fd0 /mnt -t msdos -o ro
        $ mount /tmp/diskimage /opt -t ext2 -o loop
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>mt

</emphasis></term>
<listitem><para></para>

<para>
Usage: mt [<emphasis>-f</emphasis> device] opcode value


</para>

<para>
Control magnetic tape drive operation


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>mv

</emphasis></term>
<listitem><para></para>

<para>
Usage: mv SOURCE DEST


</para>

<para>
<screen>
   or: mv SOURCE... DIRECTORY
</screen>


</para>

<para>
Rename SOURCE to DEST, or move <literal>SOURCE(s)</literal> to DIRECTORY.


</para>

<para>
Example:


</para>

<para>
<screen>
        $ mv /tmp/foo /bin/bar
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>nc

</emphasis></term>
<listitem><para></para>

<para>
Usage: nc [IP] [port]


</para>

<para>
Netcat opens a pipe to IP:port


</para>

<para>
Example:


</para>

<para>
<screen>
        $ nc foobar.somedomain.com 25
        220 foobar ESMTP Exim 3.12 #1 Sat, 15 Apr 2000 00:03:02 -0600
        help
        214-Commands supported:
        214-    HELO EHLO MAIL RCPT DATA AUTH
        214     NOOP QUIT RSET HELP
        quit
        221 foobar closing connection
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>nslookup

</emphasis></term>
<listitem><para></para>

<para>
Usage: nslookup [HOST]


</para>

<para>
Queries the nameserver for the IP address of the given HOST


</para>

<para>
Example:


</para>

<para>
<screen>
        $ nslookup localhost
        Server:     default
        Address:    default
</screen>


</para>

<para>
<screen>
        Name:       debian
        Address:    127.0.0.1
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>ping

</emphasis></term>
<listitem><para></para>

<para>
Usage: ping [OPTION]... host


</para>

<para>
Send ICMP ECHO_REQUEST packets to network hosts.


</para>

<para>
Options:


</para>

<para>
<screen>
        -c COUNT        Send only COUNT pings.
        -s SIZE         Send SIZE data bytes in packets (default=56).
        -q              Quiet mode, only displays output at start
                        and when finished.
Example:
</screen>


</para>

<para>
<screen>
        $ ping localhost
        PING slag (127.0.0.1): 56 data bytes
        64 bytes from 127.0.0.1: icmp_seq=0 ttl=255 time=20.1 ms
</screen>


</para>

<para>
<screen>
        --- debian ping statistics ---
        1 packets transmitted, 1 packets received, 0% packet loss
        round-trip min/avg/max = 20.1/20.1/20.1 ms
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>poweroff

</emphasis></term>
<listitem><para></para>

<para>
Shuts down the system, and requests that the kernel turn off power upon
halting.


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>printf

</emphasis></term>
<listitem><para></para>

<para>
Usage: printf format [argument...]


</para>

<para>
Formats and prints the given data in a manner similar to the C printf
command.


</para>

<para>
Example:


</para>

<para>
<screen>
        $ printf "Val=%d\n" 5
        Val=5
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>ps

</emphasis></term>
<listitem><para></para>

<para>
Usage: ps


</para>

<para>
Report process status


</para>

<para>
This version of ps accepts no options.


</para>

<para>
Example:


</para>

<para>
<screen>
        $ ps
  PID  Uid      Gid State Command
    1 root     root     S init
    2 root     root     S [kflushd]
    3 root     root     S [kupdate]
    4 root     root     S [kpiod]
    5 root     root     S [kswapd]
  742 andersen andersen S [bash]
  743 andersen andersen S -bash
  745 root     root     S [getty]
 2990 andersen andersen R ps
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>pwd

</emphasis></term>
<listitem><para></para>

<para>
Prints the full filename of the current working directory.


</para>

<para>
Example:


</para>

<para>
<screen>
        $ pwd
        /root
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>reboot

</emphasis></term>
<listitem><para></para>

<para>
Instructs the kernel to reboot the system.


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>rm

</emphasis></term>
<listitem><para></para>

<para>
Usage: rm [OPTION]... FILE...


</para>

<para>
Remove (unlink) the <literal>FILE(s).</literal> You may use '--' to
indicate that all following arguments are non-options.


</para>

<para>
Options:


</para>

<para>
<screen>
        -f              remove existing destinations, never prompt
        -r or -R        remove the contents of directories recursively
</screen>


</para>

<para>
Example:


</para>

<para>
<screen>
        $ rm -rf /tmp/foo
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>rmdir

</emphasis></term>
<listitem><para></para>

<para>
Usage: rmdir [OPTION]... DIRECTORY...


</para>

<para>
Remove the <literal>DIRECTORY(ies),</literal> if they are empty.


</para>

<para>
Example:


</para>

<para>
<screen>
        # rmdir /tmp/foo
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>rmmod

</emphasis></term>
<listitem><para></para>

<para>
Usage: rmmod [OPTION]... [MODULE]...


</para>

<para>
Unloads the specified kernel modules from the kernel.


</para>

<para>
Options:


</para>

<para>
<screen>
        -a      Try to remove all unused kernel modules.
</screen>


</para>

<para>
Example:


</para>

<para>
<screen>
        $ rmmod tulip
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>sed

</emphasis></term>
<listitem><para></para>

<para>
Usage: sed [<emphasis>-n</emphasis>] <emphasis>-e</emphasis> script [file...]


</para>

<para>
Allowed sed scripts come in the following form:


</para>

<para>
<screen>
        'ADDR [!] COMMAND'
</screen>


</para>

<para>
<screen>
        where address ADDR can be:
          NUMBER    Match specified line number
          $         Match last line
          /REGEXP/  Match specified regexp
          (! inverts the meaning of the match)
</screen>


</para>

<para>
<screen>
        and COMMAND can be:
          s/regexp/replacement/[igp]
                 which attempt to match regexp against the pattern space
                 and if successful replaces the matched portion with replacement.
</screen>


</para>

<para>
<screen>
          aTEXT
                 which appends TEXT after the pattern space
</screen>


</para>

<para>
Options:


</para>

<para>
<screen>
        -e      add the script to the commands to be executed
        -n      suppress automatic printing of pattern space
</screen>


</para>

<para>
This version of sed matches full regular expressions.


</para>

<para>
Example:


</para>

<para>
<screen>
        $ echo "foo" | sed -e 's/f[a-zA-Z]o/bar/g'
        bar
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>setkeycodes

</emphasis></term>
<listitem><para></para>

<para>
Usage: setkeycodes SCANCODE KEYCODE ...


</para>

<para>
Set entries into the kernel's scancode-to-keycode map, allowing unusual
keyboards to generate usable keycodes.


</para>

<para>
SCANCODE may be either xx or e0xx (hexadecimal), and KEYCODE is given in
decimal


</para>

<para>
Example:


</para>

<para>
<screen>
        # setkeycodes e030 127
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>sfdisk

</emphasis></term>
<listitem><para></para>

<para>
Usage: sfdisk [options] device ...


</para>

<para>
device: something like /dev/hda or /dev/sda


</para>

<para>
useful options:


</para>

<para>
<screen>
    -s [or --show-size]: list size of a partition
    -c [or --id]:        print or change partition Id
    -l [or --list]:      list partitions of each device
    -d [or --dump]:      idem, but in a format suitable for later input
    -i [or --increment]: number cylinders etc. from 1 instead of from 0
    -uS, -uB, -uC, -uM:  accept/report in units of sectors/blocks/cylinders/MB
    -T [or --list-types]:list the known partition types
    -D [or --DOS]:       for DOS-compatibility: waste a little space
    -R [or --re-read]:   make kernel reread partition table
    -N# :                change only the partition with number #
    -n :                 do not actually write to disk
    -O file :            save the sectors that will be overwritten to file
    -I file :            restore these sectors again
    -v [or --version]:   print version
    -? [or --help]:      print this message
</screen>


</para>

<para>
dangerous options:


</para>

<para>
<screen>
    -g [or --show-geometry]: print the kernel's idea of the geometry
    -x [or --show-extended]: also list extended partitions on output
</screen>


</para>

<para>
<screen>
                             or expect descriptors for them on input
    -L  [or --Linux]:      do not complain about things irrelevant for Linux
    -q  [or --quiet]:      suppress warning messages
    You can override the detected geometry using:
    -C# [or --cylinders #]:set the number of cylinders to use
    -H# [or --heads #]:    set the number of heads to use
    -S# [or --sectors #]:  set the number of sectors to use
</screen>


</para>

<para>
You can disable all consistency checking with:


</para>

<para>
<screen>
    -f  [or --force]:      do what I say, even if it is stupid
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>sh

</emphasis></term>
<listitem><para></para>

<para>
Usage: sh


</para>

<para>
lash -- the BusyBox LAme SHell (command interpreter)


</para>

<para>
This command does not yet have proper documentation.  


</para>

<para>
Use lash just as you would use any other shell. It properly handles pipes,
redirects, job control, can be used as the shell for scripts (#!/bin/sh),
and has a sufficient set of builtins to do what is needed. It does not
(yet) support Bourne Shell syntax. If you need things like
``if-then-else'', ``while'', and such, use ash or bash. If you just need a
very simple and extremely small shell, this will do the job.


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>sleep

</emphasis></term>
<listitem><para></para>

<para>
Usage: sleep N


</para>

<para>
Pause for N seconds.


</para>

<para>
Example:


</para>

<para>
<screen>
        $ sleep 2
        [2 second delay results]
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>sort

</emphasis></term>
<listitem><para></para>

<para>
Usage: sort [<emphasis>-n</emphasis>] [<emphasis>-r</emphasis>] [FILE]...


</para>

<para>
Sorts lines of text in the specified files


</para>

<para>
Example:


</para>

<para>
<screen>
        $ echo -e "e\nf\nb\nd\nc\na" | sort
        a
        b
        c
        d
        e
        f
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>swapoff

</emphasis></term>
<listitem><para></para>

<para>
Usage: swapoff [OPTION] [device]


</para>

<para>
Stop swapping virtual memory pages on the given device.


</para>

<para>
Options:


</para>

<para>
<screen>
        -a      Stop swapping on all swap devices
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>swapon

</emphasis></term>
<listitem><para></para>

<para>
Usage: swapon [OPTION] [device]


</para>

<para>
Start swapping virtual memory pages on the given device.


</para>

<para>
Options:


</para>

<para>
<screen>
        -a      Start swapping on all swap devices
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>sync

</emphasis></term>
<listitem><para></para>

<para>
Usage: sync


</para>

<para>
Write all buffered filesystem blocks to disk.


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>syslogd

</emphasis></term>
<listitem><para></para>

<para>
Usage: syslogd [OPTION]...


</para>

<para>
Linux system and kernel (provides klogd) logging utility. Note that this
version of syslogd/klogd ignores /etc/syslog.conf.


</para>

<para>
Options:


</para>

<para>
<screen>
        -m NUM          Interval between MARK lines (default=20min, 0=off)
        -n              Run as a foreground process
        -K              Do not start up the klogd process
        -O FILE         Use an alternate log file (default=/var/log/messages)
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>tail

</emphasis></term>
<listitem><para></para>

<para>
Usage: tail [OPTION] [FILE]...


</para>

<para>
Print last 10 lines of each FILE to standard output. With more than one
FILE, precede each with a header giving the file name. With no FILE, or
when FILE is -, read standard input.


</para>

<para>
Options:


</para>

<para>
<screen>
        -n NUM          Print last NUM lines instead of first 10
        -f              Output data as the file grows.  This version
                        of 'tail -f' supports only one file at a time.
</screen>


</para>

<para>
Example:


</para>

<para>
<screen>
        $ tail -n 1 /etc/resolv.conf
        nameserver 10.0.0.1
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>tar

</emphasis></term>
<listitem><para></para>

<para>
Usage: tar -[cxtvO] [<emphasis>--exclude</emphasis> File] [<emphasis>-f</emphasis> tarFile] [FILE] ...


</para>

<para>
Create, extract, or list files from a tar file. Note that this version of
tar treats hard links as separate files.


</para>

<para>
Main operation mode:


</para>

<para>
<screen>
        c               create
        x               extract
        t               list
</screen>


</para>

<para>
File selection:


</para>

<para>
<screen>
        f               name of tarfile or "-" for stdin
        O               extract to stdout
        --exclude       file to exclude
</screen>


</para>

<para>
Informative output:


</para>

<para>
<screen>
        v               verbosely list files processed
</screen>


</para>

<para>
Example:


</para>

<para>
<screen>
        $ zcat /tmp/tarball.tar.gz | tar -xf -
        $ tar -cf /tmp/tarball.tar /usr/local
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>tee

</emphasis></term>
<listitem><para></para>

<para>
Usage: tee [OPTION]... [FILE]...


</para>

<para>
Copy standard input to each FILE, and also to standard output.


</para>

<para>
Options:


</para>

<para>
<screen>
        -a      append to the given FILEs, do not overwrite
</screen>


</para>

<para>
Example:


</para>

<para>
<screen>
        $ echo "Hello" | tee /tmp/foo
        $ cat /tmp/foo
        Hello
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>telnet

</emphasis></term>
<listitem><para></para>

<para>
Usage: telnet host [port]


</para>

<para>
Telnet is used to establish interactive communication with another computer
over a network using the TELNET protocol.


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>test, [

</emphasis></term>
<listitem><para></para>

<para>
Usage: test EXPRESSION or [ EXPRESSION ]


</para>

<para>
Checks file types and compares values returning an exit code determined by
the value of EXPRESSION.


</para>

<para>
Example:


</para>

<para>
<screen>
        $ test 1 -eq 2
        $ echo $?
        1
        $ test 1 -eq 1
        $ echo $?
        0
        $ [ -d /etc ]
        $ echo $?
        0
        $ [ -d /junk ]
        $ echo $?
        1
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>touch

</emphasis></term>
<listitem><para></para>

<para>
Usage: touch [<emphasis>-c</emphasis>] file [file ...]


</para>

<para>
Update the last-modified date on (or create) the selected file[s].


</para>

<para>
Example:


</para>

<para>
<screen>
        $ ls -l /tmp/foo
        /bin/ls: /tmp/foo: No such file or directory
        $ touch /tmp/foo
        $ ls -l /tmp/foo
        -rw-rw-r--    1 andersen andersen        0 Apr 15 01:11 /tmp/foo
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>tr

</emphasis></term>
<listitem><para></para>

<para>
Usage: tr [-cds] STRING1 [STRING2]


</para>

<para>
Translate, squeeze, and/or delete characters from standard input, writing
to standard output.


</para>

<para>
Options:


</para>

<para>
<screen>
        -c      take complement of STRING1
        -d      delete input characters coded STRING1
        -s      squeeze multiple output characters of STRING2 into one character
</screen>


</para>

<para>
Example:


</para>

<para>
<screen>
        $ echo "gdkkn vnqkc" | tr [a-y] [b-z]
        hello world
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>true

</emphasis></term>
<listitem><para></para>

<para>
Returns an exit code of TRUE (0)


</para>

<para>
Example:


</para>

<para>
<screen>
        $ true
        $ echo $?
        0
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>tty

</emphasis></term>
<listitem><para></para>

<para>
Usage: tty


</para>

<para>
Print the file name of the terminal connected to standard input.


</para>

<para>
Options:


</para>

<para>
<screen>
        -s      print nothing, only return an exit status
</screen>


</para>

<para>
Example:


</para>

<para>
<screen>
        $ tty
        /dev/tty2
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>umount

</emphasis></term>
<listitem><para></para>

<para>
Usage: umount [flags] filesystem|directory


</para>

<para>
Flags:


</para>

<para>
<screen>
                -a:     Unmount all file systems
                -r:     Try to remount devices as read-only if mount is busy
                -f:     Force filesystem umount (i.e. unreachable NFS server)
                -l:     Do not free loop device (if a loop device has been used)
</screen>


</para>

<para>
Example:


</para>

<para>
<screen>
        $ umount /dev/hdc1 
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>uname

</emphasis></term>
<listitem><para></para>

<para>
Usage: uname [OPTION]...


</para>

<para>
Print certain system information. With no OPTION, same as <emphasis>-s</emphasis>.


</para>

<para>
Options:


</para>

<para>
<screen>
        -a      print all information
        -m      the machine (hardware) type
        -n      print the machine's network node hostname
        -r      print the operating system release
        -s      print the operating system name
        -p      print the host processor type
        -v      print the operating system version
</screen>


</para>

<para>
Example:


</para>

<para>
<screen>
        $ uname -a
        Linux debian 2.2.15pre13 #5 Tue Mar 14 16:03:50 MST 2000 i686 unknown
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>uniq

</emphasis></term>
<listitem><para></para>

<para>
Usage: uniq [OPTION]... [INPUT [OUTPUT]]


</para>

<para>
Discard all but one of successive identical lines from INPUT (or standard
input), writing to OUTPUT (or standard output).


</para>

<para>
Example:


</para>

<para>
<screen>
        $ echo -e "a\na\nb\nc\nc\na" | sort | uniq
        a
        b
        c
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>update

</emphasis></term>
<listitem><para></para>

<para>
Usage: update [options]


</para>

<para>
Periodically flushes filesystem buffers.


</para>

<para>
Options:


</para>

<para>
<screen>
        -S      force use of sync(2) instead of flushing
        -s SECS call sync this often (default 30)
        -f SECS flush some buffers this often (default 5)
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>uptime

</emphasis></term>
<listitem><para></para>

<para>
Usage: uptime


</para>

<para>
Tells how long the system has been running since boot.


</para>

<para>
Example:


</para>

<para>
<screen>
        $ uptime
          1:55pm  up  2:30, load average: 0.09, 0.04, 0.00
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>usleep

</emphasis></term>
<listitem><para></para>

<para>
Usage: usleep N


</para>

<para>
Pauses for N microseconds.


</para>

<para>
Example:


</para>

<para>
<screen>
        $ usleep 1000000
        [pauses for 1 second]
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>uudecode

</emphasis></term>
<listitem><para></para>

<para>
Usage: uudecode [OPTION] [FILE]


</para>

<para>
Uudecode a uuencoded file


</para>

<para>
Options:


</para>

<para>
<screen>
        -o FILE  direct output to FILE
</screen>


</para>

<para>
Example:


</para>

<para>
<screen>
        $ uudecode -o busybox busybox.uu
        $ ls -l busybox
        -rwxr-xr-x   1 ams      ams        245264 Jun  7 21:35 busybox
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>uuencode

</emphasis></term>
<listitem><para></para>

<para>
Usage: uuencode [OPTION] [INFILE] REMOTEFILE


</para>

<para>
Uuencode a file.


</para>

<para>
Options:


</para>

<para>
<screen>
        -m      use base64 encoding as of RFC1521
</screen>


</para>

<para>
Example:


</para>

<para>
<screen>
        $ uuencode busybox busybox
        begin 755 busybox
        M?T5,1@$!`0````````````(``P`!````L+@$"#0```!0N@,``````#0`(``&amp;
        .....
        $ uudecode busybox busybox &gt; busybox.uu
        $
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>wc

</emphasis></term>
<listitem><para></para>

<para>
Usage: wc [OPTION]... [FILE]...


</para>

<para>
Print line, word, and byte counts for each FILE, and a total line if more
than one FILE is specified. With no FILE, read standard input.


</para>

<para>
Options:


</para>

<para>
<screen>
        -c      print the byte counts
        -l      print the newline counts
        -L      print the length of the longest line
        -w      print the word counts
</screen>


</para>

<para>
Example:


</para>

<para>
<screen>
        $ wc /etc/passwd
             31      46    1365 /etc/passwd
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>which

</emphasis></term>
<listitem><para></para>

<para>
Usage: which [COMMAND ...]


</para>

<para>
Locates a COMMAND.


</para>

<para>
Example:


</para>

<para>
<screen>
        $ which login
        /bin/login
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>whoami

</emphasis></term>
<listitem><para></para>

<para>
Usage: whoami


</para>

<para>
Prints the user name associated with the current effective user id.


</para>

<para>
Example:


</para>

<para>
<screen>
        $ whoami
        andersen
</screen>


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>yes

</emphasis></term>
<listitem><para></para>

<para>
Usage: yes [OPTION]... [STRING]...


</para>

<para>
Repeatedly outputs a line with all specified <literal>STRING(s),</literal>
or `y'.


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry>
<varlistentry><term><emphasis>zcat

</emphasis></term>
<listitem><para></para>

<para>
This is essentially an alias for invoking ``gunzip <emphasis>-c</emphasis>'', where it decompresses the file in question and send the output to
stdout. 


</para>

<para>
-------------------------------


</para>

</listitem></varlistentry></variablelist>

</sect1>

<sect1 id="pod2docbook-ch-1-sect-6"><title>LIBC NSS

</title>
<!-- Bogus hack to ensure that each sect has a paragraph in it -->
<para>
</para>


<para>
GNU Libc uses the Name Service Switch (NSS) to configure the behavior of
the C library for the local environment, and to configure how it reads
system data, such as passwords and group information. BusyBox has made it
Policy that it will never use NSS, and will never use and libc calls that
make use of NSS. This allows you to run an embedded system without the need
for installing an /etc/nsswitch.conf file and without and /lib/libnss_*
libraries installed.


</para>

<para>
If you are using a system that is using a remote LDAP server for
authentication via GNU libc NSS, and you want to use BusyBox, then you will
need to adjust the BusyBox source. Chances are though, that if you have
enough space to install of that stuff on your system, then you probably
want the full GNU utilities.


</para>

</sect1>

<sect1 id="pod2docbook-ch-1-sect-7"><title>SEE ALSO

</title>
<!-- Bogus hack to ensure that each sect has a paragraph in it -->
<para>
</para>


<para>
<literal>textutils(1),</literal> <literal>shellutils(1),</literal> etc...


</para>

</sect1>

<sect1 id="pod2docbook-ch-1-sect-8"><title>MAINTAINER

</title>
<!-- Bogus hack to ensure that each sect has a paragraph in it -->
<para>
</para>


<para>
Erik Andersen &lt;andersee@debian.org&gt; &lt;andersen@lineo.com&gt;


</para>

</sect1>

<sect1 id="pod2docbook-ch-1-sect-9"><title>AUTHORS

</title>
<!-- Bogus hack to ensure that each sect has a paragraph in it -->
<para>
</para>


<para>
The following people have contributed code to BusyBox whether they know it
or not.


</para>

<para>
Erik Andersen &lt;andersee@debian.org&gt;


</para>

<para>
John Beppu &lt;beppu@lineo.com&gt;


</para>

<para>
Brian Candler &lt;B.Candler@pobox.com&gt;


</para>

<para>
Randolph Chung &lt;tausq@debian.org&gt;


</para>

<para>
Dave Cinege &lt;dcinege@psychosis.com&gt;	


</para>

<para>
Karl M. Hegbloom &lt;karlheg@debian.org&gt;


</para>

<para>
John Lombardo &lt;john@deltanet.com&gt;	


</para>

<para>
Glenn McGrath &lt;bug1@netconnect.com.au&gt;


</para>

<para>
Bruce Perens &lt;bruce@perens.com&gt;


</para>

<para>
Pavel Roskin &lt;proski@gnu.org&gt;


</para>

<para>
Linus Torvalds &lt;torvalds@transmeta.com&gt;


</para>

<para>
Charles P. Wright &lt;cpwright@villagenet.com&gt;


</para>

<para>
Enrique Zanardi &lt;ezanardi@ull.es&gt;


</para>

</sect1>

</chapter>


</book>    <!-- End of the book -->