举例：
[root@localhost beinan]# df -lh
Filesystem 容量 已用 可用 已用% 挂载点
/dev/hda8 11G 6.0G 4.4G 58% /
/dev/shm 236M 0 236M 0% /dev/shm
/dev/sda1 56G 22G 35G 39% /mnt/sda1
linux 系统启动报错：unexpected inconsistency run fsck manually
An error occurred during the filesystem check
Propping you to shell the system will reboot
when you leave the shell
Give root password for mantennance
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