Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question: 

$version = '$Id: bawt.pl,v 1.239 2001/07/09 04:29:39 dfraser Exp dfras
+er $';

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I see this alot in scripts how do I get that? is there a cmd?

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Re: script version
by Masem (Monsignor) on Aug 19, 2001 at 22:12 UTC
    This is typically inserted by a control-revisioning system. At least, if you start with something like: 
    $version = '$Id$';

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    then when it's checked out, the ID will be expanded into the string above. Furthermore, the string will be updated on further checkouts.

    -----------------------------------------------------
    Dr. Michael K. Neylon - mneylon-pm@masemware.com || "You've left the lens cap of your mind on again, Pinky" - The Brain

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      checked out? examples on how to do it?
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        If you are looking for a SCCS (Source Code Control System) or a VCS (Version Control System), you might check perforce - a commercial product, but free for individual non-commercial users, easy to install and use.

        Of course, there are also several open source systems around.

        Rudif

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Re: script version
by c (Hermit) on Aug 20, 2001 at 08:46 UTC
    I think the answer that you are looking for is RCS. RCS is a form of revision control in the same vein as CVS that allows for a programmer to keep multiple revisions of a file they are working on. RCS allows you to keep a log of the various revisions you've created as well as perform diffs between revisions, number them according to development and many other features that are very conducive to keeping your programming project into perspective.

    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

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