And don't forget the accursed differences in the way even the NT command line interpreter ("shell" in Unix-speak) does(n't do) globbing with the examples of "one-liner" scripts.
If you don't know what I'm talking about, try
perl -pi.bak -e "s/UNIX/Windows/" *.txt
on Unix and any flavour of Windows.
maybe that's not so helpful, but it bothers me so much =)
If not P, what? Q maybe?
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