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+.ds Rv 5.10.1
+.ds Dt 2022-08-17
+.ds i \&\s-1ISO\s0
+.ds r \&\s-1RCS\s0
+.ds u \&\s-1UTC\s0
+.ds o \*r file
+.if n .ds - \%--
+.if t .ds - \(em
+.TH RCSDIFF 1 "\*(Dt" "GNU RCS \*(Rv"
+.SH NAME
+rcsdiff \- compare RCS revisions
+.SH SYNOPSIS
+.B rcsdiff
+[
+.BI \-k subst
+] [
+.B \-q
+] [
+.BI \-r rev1
+[
+.BI \-r rev2
+] ] [
+.B \-T
+] [
+.RI "\f3\-V\fP[" n ]
+] [
+.BI \-x suffixes
+] [
+.BI \-z zone
+] [
+.I "diff options"
+]
+.I "file .\|.\|."
+.SH DESCRIPTION
+.B rcsdiff
+runs
+.BR diff (1)
+to compare two revisions of each \*o given.
+.PP
+Filenames matching an \*r suffix denote \*os;
+all others denote working files.
+Names are paired as explained in
+.BR ci (1).
+.PP
+The option
+.B \-q
+suppresses diagnostic output.
+Zero, one, or two revisions may be specified with
+.BR \-r .
+The option
+.BI \-k subst
+affects keyword substitution when extracting
+revisions, as described in
+.BR co (1);
+for example,
+.B "\-kk\ \-r1.1\ \-r1.2"
+ignores differences in keyword values when comparing revisions
+.B 1.1
+and
+.BR 1.2 .
+To avoid excess output from locker name substitution,
+.B \-kkvl
+is assumed if (1) at most one revision option is given,
+(2) no
+.B \-k
+option is given, (3)
+.B \-kkv
+is the default keyword substitution, and
+(4) the working file's mode would be produced by
+.BR "co\ \-l".
+See
+.BR co (1)
+for details
+about
+.BR \-T ,
+.BR \-V ,
+.B \-x
+and
+.BR \-z .
+Otherwise, all options of
+.BR diff (1)
+that apply to regular files are accepted, with the same meaning as for
+.BR diff .
+.PP
+If both
+.I rev1
+and
+.I rev2
+are omitted,
+.B 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.
+.PP
+If
+.I rev1
+is given, but
+.I rev2
+is omitted,
+.B rcsdiff
+compares revision
+.I rev1
+of the \*o with
+the contents of the corresponding working file.
+.PP
+If both
+.I rev1
+and
+.I rev2
+are given,
+.B rcsdiff
+compares revisions
+.I rev1
+and
+.I rev2
+of the \*o.
+.PP
+Both
+.I rev1
+and
+.I rev2
+may be given numerically or symbolically.
+.SH EXAMPLE
+The command
+.LP
+.B "        rcsdiff  f.c"
+.LP
+compares the latest revision on the default branch of the \*o
+to the contents of the working file
+.BR f.c .
+.SH ENVIRONMENT
+.TP
+.B \s-1RCSINIT\s0
+Options prepended to the argument list, separated by spaces.
+A backslash escapes spaces within an option.
+The
+.B \s-1RCSINIT\s0
+options are prepended to the argument lists of most \*r commands.
+Useful
+.B \s-1RCSINIT\s0
+options include
+.BR \-q ,
+.BR \-V ,
+.BR \-x ,
+and
+.BR \-z .
+.TP
+.B \s-1RCS_MEM_LIMIT\s0
+Normally, for speed, commands either memory map or copy into memory
+the \*o if its size is less than the
+.IR memory-limit ,
+currently defaulting to ``unlimited''.
+Otherwise (or if the initially-tried speedy ways fail),
+the commands fall back to using
+standard i/o routines.
+You can adjust the memory limit by setting
+.B \s-1RCS_MEM_LIMIT\s0
+to a numeric value
+.IR lim
+(measured in kilobytes).
+An empty value is silently ignored.
+As a side effect, specifying
+.B \s-1RCS_MEM_LIMIT\s0
+inhibits fall-back to slower routines.
+.TP
+.B \s-1TMPDIR\s0
+Name of the temporary directory.
+If not set, the environment variables
+.B \s-1TMP\s0
+and
+.B \s-1TEMP\s0
+are inspected instead and the first value found is taken;
+if none of them are set,
+a host-dependent default is used, typically
+.BR /tmp .
+.SH DIAGNOSTICS
+Exit status is 0 for no differences during any comparison,
+1 for some differences, 2 for trouble.
+.ds EY 1990, 1991, 1992, 1993
+.SH IDENTIFICATION
+Author: Walter F. Tichy.
+.br
+Manual Page Revision: \*(Rv; Release Date: \*(Dt.
+.br
+Copyright \(co 2010-2022 Thien-Thi Nguyen.
+.br
+Copyright \(co \*(EY Paul Eggert.
+.br
+Copyright \(co 1982, 1988, 1989 Walter F. Tichy.
+.br
+.SH "SEE ALSO"
+.BR ci (1),
+.BR co (1),
+.BR diff (1),
+.BR ident (1),
+.BR rcs (1),
+.BR rcsmerge (1),
+.BR rlog (1).
+.PP
+Walter F. Tichy,
+\*r\*-A System for Version Control,
+.I "Software\*-Practice & Experience"
+.BR 15 ,
+7 (July 1985), 637-654.
+.PP
+The full documentation for \*r is maintained as a Texinfo manual.
+If the
+.BR info (1)
+and \*r programs are properly installed at your site, the command
+.IP
+.B info rcs
+.PP
+should give you access to the complete manual.
+Additionally, the \*r homepage:
+.IP
+.B http://www.gnu.org/software/rcs/
+.PP
+has news and links to the latest release, development site, etc.