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Running 30,000 individual, separate shells to run 30,000 commands is wrong, period. That's like making 300 phonecalls to say 300 words. You never have to do that, even if you're processing the...

The -i switch edits each file in-place. Use it with care. Next example saves the file appending .orig to it and later changes the original:

$ perl -i.orig script.pl infile bertha kucarNext command...