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12. Keyword substitution

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.

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