.\"-
.\" Copyright 2003-2005 Colin Percival
.\" All rights reserved
.\"
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.\" modification, are permitted providing that the following conditions
.\" are met:
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\"
.\" $FreeBSD: src/usr.bin/bsdiff/bsdiff/bsdiff.1,v 1.1 2005/08/06 01:59:05 cperciva Exp $
.\"
.Dd May 18, 2003
.Dt BSDIFF 1
.Os FreeBSD
.Sh NAME
.Nm bsdiff
.Nd generate a patch between two binary files
.Sh SYNOPSIS
.Nm
.Ao Ar oldfile Ac Ao Ar newfile Ac Ao Ar patchfile Ac
.Sh DESCRIPTION
.Nm
compares
.Ao Ar oldfile Ac
to
.Ao Ar newfile Ac
and writes to
.Ao Ar patchfile Ac
a binary patch suitable for use by bspatch(1).
When
.Ao Ar oldfile Ac
and
.Ao Ar newfile Ac
are two versions of an executable program, the
patches produced are on average a factor of five smaller
than those produced by any other binary patch tool known
to the author.
.Pp
.Nm
uses memory equal to 17 times the size of 
.Ao Ar oldfile Ac ,
and requires
an absolute minimum working set size of 8 times the size of oldfile.
.Sh SEE ALSO
.Xr bspatch 1
.Sh AUTHORS
.An Colin Percival Aq cperciva@freebsd.org