Shell脚本检测文件夹是否已被挂载的方法

方法1：

1. if grep -qs '/mnt/foo' /proc/mounts; then
2. echo "It's mounted."
3. else
4. echo "It's not mounted."
5. fi

方法2：

1. if mountpoint -q /mnt/foo
2. then
3. echo "mounted"
4. else
5. echo "not mounted"
6. fi