Keyword substitution

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Keyword substitution
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   As long as you edit source files inside your working copy of a
module you can always find out the state of your files via `cvs status'
and `cvs log'.  But as soon as you export the files from your
development environment it becomes harder to identify which revisions
they are.

   CVS can use a mechanism known as "keyword substitution" (or "keyword
expansion") to help identifying the files.  Embedded strings of the form
`$KEYWORD$' and `$KEYWORD:...$' in a file are replaced with strings of
the form `$KEYWORD:VALUE$' whenever you obtain a new revision of the
file.

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