From owner-cvs-all  Thu Jun 24  2: 4:53 1999
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Date: Thu, 24 Jun 1999 19:04:36 +1000
From: Bruce Evans <bde@zeta.org.au>
Message-Id: <199906240904.TAA06671@godzilla.zeta.org.au>
To: bde@zeta.org.au, hm@hcs.de
Subject: Re: getopt -? illegal ? (was: cvs commit: src/usr.sbin/i4b/isdnd main.c ..)
Cc: cvs-all@FreeBSD.org, cvs-committers@FreeBSD.org, imp@FreeBSD.org
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>> "-?" is an invalid option that can be (ab)used to display the usage
>> message.  It is clearly invalid for the i4b programs because none of the
>> i4b man pages document it :-).  Documenting it in all man pages wouldn't
>> be useful.
>> 
>> getopt actually says that "-?" is an illegal option.
>
>Since the very first days i learned Unix, i was - and i still am - under the
>impression that running a program with -? produces a usage message.

-? normally produces an invalid option, and all invalid options should
produce a usage message.  All cases are normally handled by a
`default: usage();' case in the switch on the value returned by getopt().

Bruce


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