rcs (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.

Usage: rcs [options] command [command-arg ...] Dispatch an RCS command. Options: --commands Display available commands and exit. --aliases Display command aliases and exit. --help COMMAND Display help for COMMAND. To display help for the legacy interface, use: --help frob 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/>