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Go up to Watches.

Telling CVS to watch certain files
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   To enable the watch features, you first specify that certain files
are to be watched.

 - Command: cvs watch on [`-lR'] FILES ...
     Specify that developers should run `cvs edit' before editing
     FILES.  CVS will create working copies of FILES read-only, to
     remind developers to run the `cvs edit' command before working on
     them.

     If FILES includes the name of a directory, CVS arranges to watch
     all files added to the corresponding repository directory, and
     sets a default for files added in the future; this allows the user
     to set notification policies on a per-directory basis.  The
     contents of the directory are processed recursively, unless the
     `-l' option is given.  The `-R' option can be used to force
     recursion if the `-l' option is set in `~/.cvsrc' (
see ~/.cvsrc.).

     If FILES is omitted, it defaults to the current directory.


 - Command: cvs watch off [`-lR'] FILES ...
     Do not provide notification about work on FILES.  CVS will create
     working copies of FILES read-write.

     The FILES and options are processed as for `cvs watch on'.