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| Options: -a, --all 卸载所有文件系统,慎用 -A, --all-targets unmount all mountpoins for the given device in the current namespace -c, --no-canonicalize don't canonicalize paths -d, --detach-loop if mounted loop device, also free this loop device --fake dry run; skip the umount(2) syscall -f, --force 强制卸载,可用于NFS挂载异常时使用 -i, --internal-only don't call the umount.<type> helpers -n, --no-mtab don't write to /etc/mtab -l, --lazy detach the filesystem now, and cleanup all later -O, --test-opts <list> limit the set of filesystems (use with -a) -R, --recursive recursively unmount a target with all its children -r, --read-only 如果卸载失败,则尝试重新以只读方式挂载 -t, --types <list> limit the set of filesystem types -v, --verbose 显示详情
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