RCS
From Notes
Basic version control system.
New use:
1. Create an RCS directory to prevent revision files in the current working directory.
mkdir /etc/cups/RCS
2. Check in a file using the -u flag to ensure that the file sticks around unlocked so you can use it.
ci -l -u cupsd.conf
Note that the file is now read-only to indicate that it needs to be checked out before editing.
3. Check out a file for editing.
co -l cupsd.conf
The file should now be available for writing (permissions 664 or similar).
4. Check the file back in when done editing to mark revisions.
ci -u cupsd.conf
