Date: Tue, 16 May 2000 22:30:08 +0100 From: Mark Ovens <mark@ukug.uk.freebsd.org> To: cjclark@home.com Cc: Erik Trulsson <ertr1013@student.csd.uu.se>, questions@freebsd.org Subject: Re: getopt(1) or getopts(1)? Message-ID: <20000516223008.D1491@parish> In-Reply-To: <20000515220432.A55458@cc942873-a.ewndsr1.nj.home.com>; from cjc@cc942873-a.ewndsr1.nj.home.com on Mon, May 15, 2000 at 10:04:33PM -0400 References: <20000511231319.C1522@parish> <20000512084656.A1146@student.csd.uu.se> <20000512183403.A233@parish> <20000513013931.C39310@cc942873-a.ewndsr1.nj.home.com> <20000514110900.B232@parish> <20000514113604.A50543@cc942873-a.ewndsr1.nj.home.com> <20000515234055.C233@parish> <20000515220432.A55458@cc942873-a.ewndsr1.nj.home.com>
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On Mon, May 15, 2000 at 10:04:33PM -0400, Crist J. Clark wrote:
> On Mon, May 15, 2000 at 11:40:56PM +0100, Mark Ovens wrote:
> > On Sun, May 14, 2000 at 11:36:04AM -0400, Crist J. Clark wrote:
> > > On Sun, May 14, 2000 at 11:09:00AM +0100, Mark Ovens wrote:
> > > >
> >
> > [snip]
> >
> > > >
> > > > I'd almost got there, except I didn't know that shift wasn't needed.
> > > >
> > > > > Almost makes life too easy, huh?
> > > >
> > > > Almost. It does seem somewhat lacking in the error handling dept.
> > > > though. Using the example code above, if you do:
> > > >
> > > > # foobar -o -a -b
> > > >
> > > > then getopts(1) thinks that ``-a'' is the argument to ``-o''.
> > >
> > > How do you know it is not?
> > >
> >
> > If ``-a'' is a valid argument to ``-o'' then it would require special
> > handling, not unlike filenames starting with ``-'', or containing
> > metacharacters, they need quoting.
>
> Is this standardized somewhere? And since when do filenames starting
> with '-' need special handling all of the time? A lot of common tools
> do not behave that way,
>
> $ echo -v | grep -e -v
> -v
> $ { echo \#!/bin/sh; echo echo YES; } > -a
> $ chmod 755 -a
> $ sh -c -a
> YES
> $
>
> Including sh(1) itself. But of course...
>
> $ rm -a
> rm: illegal option -- a
> usage: rm [-f | -i] [-dPRrvW] file ...
> unlink file
> $ rm -- -a
> $
>
> Lotsa times '-' files do.
OK, point taken :) I was just surprised that the newer getopts(1)
wasn't more comprehensive, but if that's the way it works then I'm
quite happy with it.
Thanks again for your help.
> --
> Crist J. Clark cjclark@home.com
--
...and on the eighth day God created UNIX
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