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Subject: Re: getopts appears to not be shifting $@ when consuming options
To:     dash@vger.kernel.org
References: <YBRTFXGM6pLwR5hg@teapot> <20210129203650.GA21262@stack.nl>
 <YBSLRXjBSbNmOHP2@teapot>
From:   "Vladimir N. Oleynik" <dzo@simtreas.ru>
Organization: Ulyanovsk Treasury
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Date:   Sat, 30 Jan 2021 10:39:41 +0400
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Hello,

>> set -- -a foo -a bar # for testing
>> while getopts :a: arg; do
>> ...

You can use typical array cryptic emulation with dash for this :)

#!/bin/dash

main() {
   local i=0 l= oIFS="$IFS" n=

   while getopts :a:u:n: arg; do
     case $arg in
      a) local l$((i=i+1))="$OPTARG"; l="${l}${l:+ }"'attr="$l'$i\";;
      n) n=$OPTARG;;
     esac
   done
   shift "$((OPTIND - 1))"
   IFS=' '; eval set -- $l '"$@"'; IFS=$oIFS

   echo '$@:' "$@"
   echo "n=$n"
}

main -a "foo 1" -a '$((ls))' -u unused -n x -n last_n_val a1 a2