Bash でマウント状態を調べる

コード

#!/bin/bash
target="/mnt/share"
mount_src="//10.1.1.2/everyone"
if mount | grep ${target} > /dev/null; then
    echo "yay"
    umount ${target}
else
    echo "nay"
    mount.cifs ${mount_src} ${target} -o guest,vers=default
fi