ci -q[ R ] Quiet mode; don't show diagnostic output. R specifies a file revision. -V[ n ] Emulate version n of RCS; useful when trading files between systems that run different versions. n can be 3, 4, or 5. If n is omitted, the command prints the version number of this version of RCS. -xsuffixes Specify an alternate list of suffixes for RCS files. Each suffix is separated by a /. On Unix systems, RCS files normally end with the characters ,v. The -x option provides a workaround for systems that don't allow a comma (,) character in filenames. -z[ zone ] Specify the format of the date in keyword substitution. If empty, the default is to output the UTC time with no zone indication. With an argument of LT, the local time zone will be used to output an ISO 8601 format, with an indication of the separation from UTC. You may also specify a numeric UTC offset. For example, -z+4:30 would output a string such as: 1998-11-24 02:30:00+4:30. For example, when depositing a working file into an RCS file, the command: ci -x,v/ ch01