There is an excellent book on the subject, but gets pretty in depth and complicated. If you're just looking to get some of the basics in, you can check out this tutorial.
For the 2 minute answer to your question. RCS supports a couple different informational 'tags' that you can add within your code which expand to a larger piece of text. By adding $Id:$ to your file being held by RCS, the tag expands to the larger piece of information that you have in your example.
humbly -c
In reply to Re: script version
by c
in thread script version
by Anonymous Monk
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