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.

       Filenames 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.  A backslash escapes spaces within an option.  The RCSINIT options are
	      prepended to the argument lists of most RCS commands.  Useful RCSINIT options include -q, -V, -x, and -z.

       RCS_MEM_LIMIT
	      An integer lim, measured in kilobytes, specifying the threshold under which commands will try to	use  memory-based  operations  for
	      processing  the RCS file.  (For RCS files of size lim kilobytes or greater, RCS will use the slower standard input/output routines.)
	      Default value is 256.

       TMPDIR Name of the temporary directory.	If not set, the environment variables TMP and TEMP are inspected instead and the first value found
	      is taken; if none of them are set, a host-dependent default is used, typically /tmp.

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: 5.8.1; Release Date: 2012-06-06.
       Copyright (C) 2010-2012 Thien-Thi Nguyen.
       Copyright (C) 1990, 1991, 1992, 1993 Paul Eggert.
       Copyright (C) 1982, 1988, 1989 Walter F. Tichy.

SEE ALSO

       ci(1), co(1), diff(1), ident(1), rcs(1), rcsmerge(1), rlog(1).

       Walter F. Tichy, RCS--A System for Version Control, Software--Practice & Experience 15, 7 (July 1985), 637-654.

GNU RCS 5.8.1							    2012-06-06								RCSDIFF(1)