查看文件系统的方法：
$ df -l $ df -hl Filesystem Size Used Avail Use% Mounted on unionfs 1.9G 1.3G 454M 75% / /dev/sda4 72G 2.6G 66G 4% /var /dev/hda1 380M 26M 335M 8% /jdata /dev/sda2 152M 151M 0 100% /jseed1 /dev/sda3 152M 151M 0 100% /jseed2 tmpfs 252M 0 252M 0% /dev/shm tmpfs 252M 4.0K 252M 1% /tmp
查看单个目录挂载情况：
$ df -h /var Filesystem Size Used Avail Use% Mounted on /dev/sda4 72G 2.6G 66G 4% /var
原文：http://www.cnblogs.com/drizzlewithwind/p/6222034.html