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.\" Copyright (c) 2012 Jesse Hagewood <jesse.hagewood@gmail.com>
.\" All rights reserved.
.\"
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.\" modification, are permitted provided that the following conditions
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" zdiff.1
.Dd Aug 15, 2012
.Dt ZDIFF 1
.Os
.Sh NAME
.Nm zdiff
.Nd differential file and directory comparator for compressed files.
.Sh SYNOPSIS
.Nm zdiff
.Op Fl abdilpqTtw
.Op Fl I Ar pattern
.Oo
.Fl c | e | f |
.Fl n | u
.Oc
.Op Fl L Ar label
.Ar file1 file2
.Nm zdiff
.Op Fl abdilpqTtw
.Op Fl I Ar pattern
.Op Fl L Ar label
.Fl C Op Ar number
.Ar file1 file2
.Nm zdiff
.Op Fl abdilqtw
.Op Fl I Ar pattern
.Fl D Ar string
.Ar file1 file2
.Nm zdiff
.Op Fl abdilpqTtw
.Op Fl I Ar pattern
.Op Fl L Ar label
.Fl U Ar number
.Ar file1 file2
.Nm zdiff
.Op Fl abdilNPpqrsTtw
.Op Fl I Ar pattern
.Oo
.Fl c | e | f |
.Fl n | u
.Oc
.Bk -words
.Op Fl L Ar label
.Op Fl S Ar name
.Op Fl X Ar file
.Op Fl x Ar pattern
.Ek
.Ar dir1 dir2
.Nm zdiff
.Op Fl v
.Sh DESCRIPTION
The
.Nm
utility compares the decompressed contents of gzip
.Ar file1
and
.Ar file2
and writes to the standard output the list of changes necessary to
convert one file into the other.
No output is produced if the files are identical. See diff(1) for program options.
.Sh ENVIRONMENT
.Bl -tag -width TMPDIR
.It Ev TMPDIR
If the environment variable
.Ev TMPDIR
exists,
.Nm
will use the directory specified by
.Ev TMPDIR
as the temporary directory.
.El
.Sh FILES
.Bl -tag -width /tmp/diff.XXXXXXXX -compact
.It Pa /tmp/diff. Ns Ar XXXXXXXX
Temporary file used when comparing a device or the standard input.
Note that the temporary file is unlinked as soon as it is created
so it will not show up in a directory listing.
.El
.Sh DIAGNOSTICS
The
.Nm
utility exits with one of the following values:
.Pp
.Bl -tag -width Ds -compact -offset indent
.It 0
No differences were found.
.It 1
Differences were found.
.It \*(Gt1
An error occurred.
.El
.Sh SEE ALSO
.Xr diff 1 ,
.Xr cmp 1 ,
.Xr diff3 1 ,
.Xr sdiff 1 ,
.Xr zsdiff 1