open DATA, "/usr/bin/cvs @ARGV |" or die "Couldn't execute program: $!
+";
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I personally believe that even if probably it doesn't do any harm here, you should avoid naming your filheandle DATA since it's a predefined perl one. Of course, had you used a lexical instead, there would have been no problem a priori.

    while ( defined( my $line = <DATA> ) ) {
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As a side note: perhaps you know (and perhaps you don't know) that defined is pleonastic there since perl will dwimmily assume it implicitly for you.

        chomp($line);
        print "$line\n";
    }
close DATA;
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Sorry, but I'm very tired and I may be missing something obvious. Anyway: why are you doing this? Line ending conversion? Since it's the very last part of your script, you may even be thinking -for once- of using exec instead, couldn't you?