Date: Wed, 25 Sep 2002 21:45:49 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: Matthew Emmerton <matt@gsicomp.on.ca> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: perceived strangeness with getopt(1,3) Message-ID: <20020926024549.GL16302@dan.emsphone.com> In-Reply-To: <009b01c26500$3f7e91a0$1200a8c0@gsicomp.on.ca> References: <009b01c26500$3f7e91a0$1200a8c0@gsicomp.on.ca>
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In the last episode (Sep 25), Matthew Emmerton said:
> Maybe I'm missing something huge, but getopt(1,3) aren't working the
> way I think they should.
>
> gabby# getopt k:s: -k -s
> -k -s --
> gabby#
>
> Wha? Neither of these options specified arguments! I guess you
> could consider that -k's argument was '-s', but I was pretty sure
> that an option's argument couldn't start with a dash character (to
> avoid the ambiguity that I'm hitting right now.)
But then how could you specify a filename argument that starts with a
dash? If you accept that arguments can start with dashes there is no
ambiguity.
> I'm pretty sure I'm the one that's confused (not getopt), since I get
> the same behaviour on -STABLE and -CURRENT. Can someone tell me how
> to accomplish what I want to do? Basically, I want this:
>
> gabby# getopt k:s: -k arg1 -s
> getopt: option requires an argument -- k
> -k arg1 --
You mean "-- s" here I suppose, since -k does have an argument. getopt
does this already.
> gabby# getopt k:s: -k -s arg2
> getopt: option requires an argument -- k
> -s arg2 --
> gabby#
You'll just have to catch that in your switch-processing code, and
print an error if you get an argument that starts with a dash.
case $i in
-s )
case $2 in
-* )
echo "getopt: option requires an argument -- $i" ; exit 1 ;;
esac
flag_s=$2
shift; shift ;;
...
esac
--
Dan Nelson
dnelson@allantgroup.com
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