From: earnestly <zibeon@googlemail.com>
To: dash@vger.kernel.org
Subject: Re: getopts appears to not be shifting $@ when consuming options
Date: Fri, 29 Jan 2021 22:25:09 +0000 [thread overview]
Message-ID: <YBSLRXjBSbNmOHP2@teapot> (raw)
In-Reply-To: <20210129203650.GA21262@stack.nl>
On Fri, Jan 29, 2021 at 09:36:50PM +0100, Jilles Tjoelker wrote:
> If your actual code is more like:
>
> set -- -a foo -a bar # for testing
> while getopts :a: arg; do
> ...
>
> then the script violates the rule I mentioned, and has unspecified
> results.
This, of course, would be the intended use of such a technique.
Having read the a little more of the standard I may have come up with a
solution which both appears to work and without much ugliness. I hope
it also doesn't violate either the spirit or word of the standard on this
matter:
#!/bin/sh --
while getopts :a: arg; do
case $arg in
a) set -- "$@" attr="$OPTARG"; shift "$((OPTIND - 1))"; OPTIND=1
esac
done
shift "$((OPTIND - 1))"
It would be quite sad for me to lose this functionality.
P.S. To my amusement this works with bourne as well but shifting needs
to be undertaken with `expr "$OPTIND" - 1` instead.
next prev parent reply other threads:[~2021-01-29 22:25 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-29 18:25 getopts appears to not be shifting $@ when consuming options earnestly
2021-01-29 20:15 ` Harald van Dijk
2021-01-30 15:31 ` Harald van Dijk
2021-01-29 20:36 ` Jilles Tjoelker
2021-01-29 21:19 ` Harald van Dijk
2021-01-29 22:25 ` earnestly [this message]
2021-01-30 6:39 ` Vladimir N. Oleynik
2021-01-30 7:36 ` Vladimir N. Oleynik
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