co (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: co [options] file ... Check out working files from revisions of RCS files. Options: -f[REV] Force overwrite of working file. -I[REV] Interactive. -p[REV] Write to stdout instead of the working file. -q[REV] Quiet mode. -r[REV] Normal checkout. -l[REV] Like -r, but also lock. -u[REV] Like -l, but unlock. -M[REV] Reset working file mtime (relevant for -l, -u). -kSUBST Use SUBST substitution, one of: kv, kvl, k, o, b, v. -dDATE Select latest before or on DATE. -jJOINS Merge using JOINS, a list of REV:REV pairs; this option is obsolete -- see rcsmerge(1). -sSTATE Select matching state STATE. -S Enable "self-same" mode. -T Preserve the modification time on the RCS file even if it changes because a lock is added or removed. -wWHO Select matching login WHO. -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 and also the default timezone for -dDATE. Multiple flags in {fIlMpqru} may be used, except for -r, -l, -u, which are mutually exclusive. If specified, REV can be symbolic, numeric, or mixed: symbolic -- must have been defined previously (see ci(1)) $ -- determine the revision number from keyword values in the working file .N -- prepend default branch => DEFBR.N BR.N -- use this BR -- latest revision on branch BR If REV is omitted, take it to be the latest on the default branch. 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/>