However, as this is posted as a tutorial (and should consequently attract a lot of not-so-experienced PMs), and since perl is cross-platform, I suggest you either:
1) Add "(for *nix users only)" to your title;
2) Include a preamble about different quoting systems for one-liners on different OSs; or:
3) Point non_*nix users to perlfaq3 "Why don't perl one-liners work on my DOS/Mac/VMS system?"
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