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This is a tricky one. The “correct” thing is to send the usage message to stderr when it’s the result of a syntax error, but stdout when you request it like -h. But nobody expects that either. So “2>&1 | less” it is.

No, no, my friend. It's "|& less"

I don't trust these newfangled late-POSIX redirect punctuations ever since the noncompliant SunOS shell didn't support them