rcsmerge --version (return code: 0)
rcsmerge (GNU RCS) 5.9.4
Copyright (C) 2010-2015 Thien-Thi Nguyen
Copyright (C) 1990-1995 Paul Eggert
Copyright (C) 1982,1988,1989 Walter F. Tichy, Purdue CS
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
rcsmerge --help (return code: 0)
Usage: rcsmerge [options] file
Merge RCS revisions.
Options:
-A Passed to diff3(1).
-E Passed to diff3(1); default if unspecified.
-e Passed to diff3(1); do not warn on conflicts.
-p[REV] Write to stdout instead of overwriting the working file.
-q[REV] Quiet mode.
-rREV (one or two times) specify a revision.
-kSUBST Substitute using mode SUBST (see co(1)).
-T No effect; included for compatibility with other commands.
-V Obsolete; do not use.
-VN Emulate RCS version N.
-xSUFF Specify SUFF as a slash-separated list of suffixes
used to identify RCS file names.
-zZONE Specify date output format in keyword-substitution.
One or two revisions must be specified (using -p, -q, or -r).
If only one is specified, use the latest revision on the default
branch to be the second revision.
Report bugs to: <bug-rcs@gnu.org>
RCS home page: <http://www.gnu.org/software/rcs/>
General help using GNU software: <http://www.gnu.org/gethelp/>