(diff.info.gz) Revision Control

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 Revision Control
 ================
 
    If a nonexistent input file is under a revision control system
 supported by `patch', `patch' normally asks the user whether to get (or
 check out) the file from the revision control system.  Patch currently
 supports RCS, ClearCase and SCCS.  Under RCS and SCCS, `patch' also
 asks when the input file is read-only and matches the default version
 in the revision control system.
 
    The `-g NUM' or `--get=NUM' affects access to files under supported
 revision control systems.  If NUM is positive, `patch' gets the file
 without asking the user; if zero, `patch' neither asks the user nor
 gets the file; and if negative, `patch' asks the user before getting
 the file.  The default value of NUM is given by the value of the
 `PATCH_GET' environment variable if it is set; if not, the default
 value is zero if `patch' is conforming to POSIX, negative otherwise.
  patch and POSIX.
 
    The choice of revision control system is unaffected by the
 `VERSION_CONTROL' environment variable ( Backup Names).
 

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