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## 7. Including RCS data in working files.

`co(1)` maintains a list of keywords of the RCS database which are expanded when the working file is checked out. The keyword `$Id$` in a document will expand to a string which contains the file name, revision number, the date checked out, the author, the revision status, and the locker, if any. Including the keyword `$Log$` will expand to the document's revision history log.

These and other keywords may be used as search criteria of the RCS archive. See the `ident(1)` man page for further details.

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