Using Tie::File takes up *more* memory than not.

Your memory problems would be avoided by printing the results as you find them instead of saving them in an array and printing them all at once.

There are other issues.

• Don't use $[. It causes maintenance issues. It's deprecated. It's scheduled to be removed from the language.
• Don't reuse STDOUT instead of using a new handle. This also causes confusion.
• Get rid of the needless third arg to split, or set it to the more appropriate 4.
• Get rid of the useless $_ = $_;.

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