command line options

[Arthur David Olson]

Having a "usage" command that looks through the executable (a la "what")
to find a usage message makes it hard to produce "correct" output.

For example, the command
	usage date
such produce a message of the ilk
	date: usage is date [-u]
for normal users and a message such as
	date: usage is date [-u] [ yymmddhhmm[.ss] ]
(on a BSD-based system) for the root user.

There are other situations where usage is dependent on things that can't be
known at compile time.
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