| Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 1 | .\" -*- nroff -*- |
| Theodore Ts'o | 297f47a | 1997-04-26 14:25:20 +0000 | [diff] [blame^] | 2 | .TH CHATTR 1 "October 1995" "Version 1.01" |
| Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 3 | .SH NAME |
| 4 | chattr \- change file attributes on a Linux second extended file system |
| 5 | .SH SYNOPSIS |
| 6 | .B chattr |
| 7 | [ |
| 8 | .B \-RV |
| 9 | ] |
| 10 | [ |
| 11 | .B -v |
| 12 | version |
| 13 | ] |
| 14 | [ |
| 15 | mode |
| 16 | ] |
| 17 | .I files... |
| 18 | .SH DESCRIPTION |
| 19 | .B chattr |
| 20 | changes the files attributes on an second extended file system. |
| 21 | .PP |
| Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 22 | The format of a symbolic mode is +-=[Sacdisu]. |
| Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 23 | .PP |
| 24 | The operator `+' causes the selected attributes to be added to the |
| 25 | existing attributes of the files; `-' causes them to be removed; and |
| 26 | `=' causes them to be the only attributes that the files have. |
| 27 | .PP |
| Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 28 | The letters `Sacdisu' select the new attributes for the files: synchronous |
| 29 | updates (S), append only (a), compressed (c), immutable (i), no dump (d), |
| 30 | secure deletion (s), and undeletable (u). |
| Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 31 | .SH OPTIONS |
| 32 | .TP |
| 33 | .I -R |
| 34 | Recursively change attributes of directories and their contents. |
| 35 | .TP |
| 36 | .I -V |
| 37 | Verbosely describe changed attributes. |
| 38 | .TP |
| 39 | .I -v version |
| 40 | Set the files version. |
| Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 41 | .SH ATTRIBUTES |
| 42 | A file with the `a' attribute set can only be open in append mode for writing. |
| 43 | |
| 44 | A file with the `c' attribute set is automatically compressed on the disk |
| 45 | by the kernel. A read from this file returns uncompressed data. A write to |
| 46 | this file compresses data before storing them on the disk. |
| 47 | |
| 48 | A file with the `d' attribute set is not candidate for backup when the |
| 49 | .BR dump (8) |
| 50 | program is run. |
| 51 | |
| 52 | A file with the `i' attribute cannot be modified: it cannot be deleted or |
| 53 | renamed, no link can be created to this file and no data can be written |
| 54 | to the file. Only the superuser can set or clear this attribute. |
| 55 | |
| 56 | When a file with the `s' attribute set is deleted, its blocks are zeroed and |
| 57 | written back to the disk. |
| 58 | |
| 59 | When a file with the `S' attribute set is modified, |
| 60 | the changes are written synchronously on the disk; this is equivalent to |
| 61 | the `sync' mount option applied to a subset of the files. |
| 62 | |
| 63 | When a file with the `u' attribute set is deleted, its contents is saved. |
| 64 | This allows the user to ask for its undeletion. |
| Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 65 | .SH AUTHOR |
| 66 | .B chattr |
| 67 | has been written by Remy Card <card@masi.ibp.fr>, the developer and maintainer |
| 68 | of the ext2 fs. |
| 69 | .SH BUGS AND LIMITATIONS |
| Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 70 | As of ext2 fs 0.5a, the `c' and `u' attribute are not honoured by the kernel |
| 71 | code. |
| Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 72 | .PP |
| Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 73 | These attributes will be implemented in a future ext2 fs version. |
| Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 74 | .SH AVAILABILITY |
| 75 | .B chattr |
| Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 76 | is available for anonymous ftp from ftp.ibp.fr and tsx-11.mit.edu in |
| 77 | /pub/linux/packages/ext2fs. |
| Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 78 | .SH SEE ALSO |
| 79 | .BR lsattr (1) |