位置パラメータを変数にバックアップして後で戻す

posix_array.sh

#!/bin/sh

set -eu
[ "${BASH_VERSION:-}" ] && shopt -s expand_aliases

append_parray() {
  set -- "$1" "$2" "${2#*\'}" ''
  until [ "$2" = "$3" ] && eval "$1=\"\${$1} '\$4\$3'\""; do
    set -- "$1" "$3" "${3#*\'}" "$4${2%%\'*}'\"'\"'"
  done
}

encode_args() {
  eval "$1=; while [ \${2+x} ]; do append_parray \"$1\" \"\$2\"; shift; done"
}

alias decode_args='eval set -- '



set -- a b '' c "foo '' bar \" baz" "new \`
line'"

encode_args saved_args "$@"

set --

decode_args "$saved_args"    # eval "set -- $saved_args"

printf '[%s]\n' "$@"