Don't do everything in one huge unreadable line; break it up, and take a look at what the intermediate steps produce, and I'm sure the problem will become much clearer.

FWIW if you're processing log files using cut, grep, sort, uniq etc., you can probably also read and process them in your Perl script instead. Doing that would also be more robust, more readable/maintainable, and (if log formats change) more future-proof.

In reply to Re^3: using system command in regex by AppleFritter
in thread using system command in regex by ravi45722

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