command line options

[Richard A. O'Keefe]

To be perfectly fair, it is worth pointing out that the "-?" hack can be
exploited in a way that is immune to meta-character vagaries.  Instead of
-? or -*, use -/ (/ being the unshifted ? on most keyboards).  / is not
going to be a meta-character in any sane UNIX shell, and it isn't going
to be an option letter in any reasonable program either.  Example:
	% date -/
	usage: date [-u] [+format] [mmddhhmm[yy]] [-a sss.fff]

It's still going to return an error code rather than being regarded as a
normal use of the program, but that presumably won't bother most people.