From: earnestly <zibeon@googlemail.com>
To: dash@vger.kernel.org
Subject: getopts appears to not be shifting $@ when consuming options
Date: Fri, 29 Jan 2021 18:25:25 +0000 [thread overview]
Message-ID: <YBRTFXGM6pLwR5hg@teapot> (raw)
In this example dash will repeatedly append 'attr=foo' to the list of
parameters in an infinite loop:
#!/bin/dash -x
while getopts :a: arg -a foo -a bar; do
case $arg in
a) set -- "$@" attr="$OPTARG"
esac
done
shift "$((OPTIND - 1))"
Instead I expected this to result in parameter list containing
'attr=foo' and 'attr=bar'.
This works in all shells I have been able to test with the exception of
busybox sh:
* sh (bash)
* bash (All versions from 1.14 through 5.1.4)
* mksh (MIRBSD KSH R59 2020/05/16)
* ksh (93u+)
* zsh (5.8)
* zsh --emulate sh
* heirloom-sh (bourne)
The only workaround I've found is to explicitly use `shift 2` in the a)
case and obviate the final shift using OPTIND. This will unfortunately
break every other shell.
next reply other threads:[~2021-01-29 18:28 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-29 18:25 earnestly [this message]
2021-01-29 20:15 ` getopts appears to not be shifting $@ when consuming options 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
2021-01-30 6:39 ` Vladimir N. Oleynik
2021-01-30 7:36 ` Vladimir N. Oleynik
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