脚本无法看到以root身份运行

Question

这是我的根检查代码.如果没有通过,请不要运行脚本,因为您需要root.不确定这里出了什么问题:

if [ "whoami &2>/dev/null" != "root" ] && [ "id -un &2>/dev/null" != "root" ] ; then
    $BIN_ECHO " must be root to run this script "
    exit 1
else
    $BIN_ECHO -e " permission check passed "
fi

跑完后我得到:

must be root to run this script
[root@localhost ~]# whoami
root
[root@localhost ~]# id -un
root

Answer 1

"whoami"是一串字符.

`whoami`是命令的输出.