OT: grep for hex characters

[fergus]

Can anybody tell me how in general to grep files for hex characters 00 to ff
inclusive? I can do the 26 characters 01 to 1a (being ^A to ^Z respectively)
and also 20 to 7e (being <space>, punct, 0-9, A-Z, more punct, a-z, more
punct) but am stuck for everything else: 00, 1b to 1f and 7f to ff. Dunno, I
thought it might be something like

	find . | xargs grep -l "\x8f"

but it's obviously not that. Thanks. (Maybe I can use sed just to find
stuff, not replace it?)

Fergus
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