Full Discussion: Question concerning DIFF
Top Forums Shell Programming and Scripting Question concerning DIFF Post 302278233 by jpradley on Monday 19th of January 2009 06:40:24 PM
On my machine, if I read the man page for diff, I see:

Exit values

Exit status is 0 for no differences, 1 for some differences, 2 for errors.

So what else do you need???
 
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RCSDIFF(1)						      General Commands Manual							RCSDIFF(1)

NAME
rcsdiff - compare RCS revisions SYNOPSIS
rcsdiff [ -ksubst ] [ -q ] [ -rrev1 [ -rrev2 ] ] [ -T ] [ -V[n] ] [ -xsuffixes ] [ -zzone ] [ diff options ] file ... DESCRIPTION
rcsdiff runs diff(1) to compare two revisions of each RCS file given. Pathnames matching an RCS suffix denote RCS files; all others denote working files. Names are paired as explained in ci(1). The option -q suppresses diagnostic output. Zero, one, or two revisions may be specified with -r. The option -ksubst affects keyword sub- stitution when extracting revisions, as described in co(1); for example, -kk -r1.1 -r1.2 ignores differences in keyword values when compar- ing revisions 1.1 and 1.2. To avoid excess output from locker name substitution, -kkvl is assumed if (1) at most one revision option is given, (2) no -k option is given, (3) -kkv is the default keyword substitution, and (4) the working file's mode would be produced by co -l. See co(1) for details about -T, -V, -x and -z. Otherwise, all options of diff(1) that apply to regular files are accepted, with the same meaning as for diff. If both rev1 and rev2 are omitted, rcsdiff compares the latest revision on the default branch (by default the trunk) with the contents of the corresponding working file. This is useful for determining what you changed since the last checkin. If rev1 is given, but rev2 is omitted, rcsdiff compares revision rev1 of the RCS file with the contents of the corresponding working file. If both rev1 and rev2 are given, rcsdiff compares revisions rev1 and rev2 of the RCS file. Both rev1 and rev2 may be given numerically or symbolically. EXAMPLE
The command rcsdiff f.c compares the latest revision on the default branch of the RCS file to the contents of the working file f.c. ENVIRONMENT
RCSINIT options prepended to the argument list, separated by spaces. See ci(1) for details. DIAGNOSTICS
Exit status is 0 for no differences during any comparison, 1 for some differences, 2 for trouble. IDENTIFICATION
Author: Walter F. Tichy. Manual Page Revision: 5.5; Release Date: 1993/11/03. Copyright (C) 1982, 1988, 1989 Walter F. Tichy. Copyright (C) 1990, 1991, 1992, 1993 Paul Eggert. SEE ALSO
ci(1), co(1), diff(1), ident(1), rcs(1), rcsintro(1), rcsmerge(1), rlog(1) Walter F. Tichy, RCS--A System for Version Control, Software--Practice Experience 15, 7 (July 1985), 637-654. GNU
1993/11/03 RCSDIFF(1)

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