.\"-
.\" 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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.\" 2. Redistributions in binary form must reproduce the above copyright
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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
.Ar oldfile newfile patchfile
.Sh DESCRIPTION
.Nm
compares
.Ar oldfile
to
.Ar newfile
and writes to
.Ar patchfile
a binary patch suitable for use by
.Xr bspatch 1 .
When
.Ar oldfile
and
.Ar newfile
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 
.Ar oldfile ,
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