"Unfortunately i am not much familiar about how to use commands inside perl script."

This would be a good place to start: perlintro: Perl introduction for beginners

This document will lead you through the creation of a Perl script. It's not particularly lengthy and shouldn't take you long to read. Each section has links to more detailed information: follow as necessary.

— Ken

In reply to Re^3: in file insert character in every row on nth position by kcott
in thread in file insert character in every row on nth position by ukhare

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