.\" $FreeBSD$
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.\" Written by Raymond Lai <ray@cyth.net>.
.\" Public domain.
.\"
.\" Copyright (c) 2012 Jesse Hagewood <jesse.hagewood@gmail.com>
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.Dd $Mdocdate: Aug 16 2012 $
.Dt ZSDIFF 1
.Os
.Sh NAME
.Nm zsdiff
.Nd side-by-side diff of compressed files.
.Sh SYNOPSIS
.Nm
.Op Fl abdilstW
.Op Fl I Ar regexp
.Op Fl o Ar outfile
.Op Fl w Ar width
.Ar file1
.Ar file2
.Sh DESCRIPTION
.Nm
displays two files side by side,
with any differences between the two highlighted as follows:
new lines are marked with
.Sq \*(Gt ;
deleted lines are marked with
.Sq \*(Lt ;
and changed lines are marked with
.Sq \*(Ba .
.Pp
.Nm
can also be used to interactively merge two files,
prompting at each set of differences.
.Pp
See sdiff(1) for options.
.Pp
.Sh ENVIRONMENT
.Bl -tag -width Ds
.It Ev EDITOR , VISUAL
Specifies an editor to use with the
.Fl o
option.
If both
.Ev EDITOR
and
.Ev VISUAL
are set,
.Ev VISUAL
takes precedence.
If neither
.Ev EDITOR
nor
.Ev VISUAL
are set,
the default is
.Xr vi 1 .
.It Ev TMPDIR
Specifies a directory for temporary files to be created.
The default is
.Pa /tmp .
.El
.Sh SEE ALSO
.Xr cmp 1 ,
.Xr diff 1 ,
.Xr zdiff 1 ,
.Xr diff3 1 ,
.Xr vi 1 ,
.Xr re_format 7