(diff.info) 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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