展开存储在'tuple'中的命令

Question

在Bash中，如何以下列方式扩展存储为“元组”的命令：

#!/bin/bash
CMD=/my/cmd

DEV=/dev/loop

for setting in "${CMD} option1 option2 ${DEV}","SETTING1: yes" \
                   "${CMD} option1 ${DEV}","SETTING2: 0x01" ; do
    OLDIFS="${IFS}"
    IFS=","
    set -- $setting;
    echo $1 and $2

    #How do I expand this correctly to run the command stored in ${1}?  
    ${1}

    #... checking output using value stored in ${2}

    IFS="${OLDIFS}"

fi

目前，shell会将$ {1}解释为以空格分隔的多个命令，所以我只得到一堆“没有这样的文件或目录”