Hmm, sorry, but your answer is off-topic. The OP is writing a Perl script for achieving a given result, and your answer is: "Don't do it! Use grep!" But the code presented by the OP is not just trying to grep one file. It is looking for files in a directory, modifying these files and writing output in other files in another directory. It seems a bit difficult to do all this with a simple grep or even a awk one-liner. Of course, you could wrap the grep or the awk one-liner in a bash or sh or ksh script, but then the "no programming argument" is gone, you might as well do it in Perl, and it is likely to be more efficient in Perl.
But there is an even more important factor: a Perl script, if well designed, is portable across different platforms. Even though the script shown by the OP has an (admittedly strange) "#! /usr/bin/perl -w" shebang line, the rest of the script seems to strongly indicate the OP is running her or his script under MS Windows, probably with Strawberry Perl. I pray you: how are you going to run a grep or a awk one-liner script under Windows (unless you are using Cygwin, but the OP does not seem to be doing that)? (Well, awk may probably have been ported under Windows, I do not know, but by far most Windows users don't have it.)
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