rcs
Revision Control System - manage RCS file attributes. tldr-pages
On several platforms
Several platforms
Unlock a revision locked by another user (requires access)
rcs -u path/to/fileIdentifyLock a specific revision of a file
rcs -lrevision path/to/fileIdentifySet the strict locking mode (require lock for check-in)
rcs -L path/to/fileIdentifyAdd or replace a log message for a specific revision
rcs -mrevision:"new_message" path/to/fileIdentifyDelete a specific revision from the RCS file
rcs -orevision path/to/fileIdentify