Tracking versions with SCCS

The help command

If the command

   $ get lang

is now executed, the following message will be output:

   ERROR [lang]: not an SCCS file (co1)

The code co1 can be used with help to print a fuller explanation of the message:

   $ help co1

This gives the following explanation of why get lang produced an error message:

   co1:
   "not an SCCS file"
   A file that you think is an SCCS file
   does not begin with the characters "s.".

help is useful whenever there is doubt about the meaning of almost any SCCS message.