linux 查看磁盘剩余空间

df -h

　　

Filesystem      Size  Used Avail Use% Mounted on
/dev/xvda1       40G  3.1G   35G   9% /
tmpfs           938M     0  938M   0% /dev/shm
/dev/xvdb1       79G  3.8G   72G   5% /home