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As long as you edit source files inside a working directory 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.
12.1 Keyword List Keywords 12.2 Using keywords 12.3 Avoiding substitution 12.4 Substitution modes 12.5 Problems with the $Log$ keyword.