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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
$keyword:…$ 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 Configuring Keyword Expansion||Configuring keyword expansion|
|12.6 Problems with the $Log$ keyword.|
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