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There are a lot of useful one-liners in this one.
Using perl -e allows you to specify a script right on the command line. It's a powerful, underused feature even for people who use Perl regularly. Perl's powerful command line options make it a more flexible replacement for sed, awk, and even vi. Combine perl -e with the command line editing capability of modern shells and you can, write, test, and debug in record time.
The -p option tells Perl to act as a stream editor similar to sed and awk.
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