RCS | Revision Control System

For first time:

1. mkdir RCS (ignore if folder already exists)
   
2. rlog example.conf
3. if rlog returns no file or dir, check in the file and enter description:
   ci -u example.conf
4. if rlog returns information, check out the file to edit: 
   co -l example.conf
5. if it's not locked, you may edit the file with your favorite editor and save it.
6. check in the file and write a log:
   ci -u example.conf
7. you may check the information using rlog again.

Please make sure you understand before doing it. Google for RCS.