1、查看目录及单个文件的大小 du -hs -m /usr/local/webserver/mysql/
含义:查看/usr/local/webserver/mysql/的大小以M为单位显示
2、查看磁盘的空间大小 系统挂载在/dev/mapper/VolGroup00-LogVol00上,下面还挂载了/dev/sda1
[root@CentOS58 var]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
15G 11G 3.3G 77% /
/dev/sda1 99M 13M 82M 14% /boot
tmpfs 3.0G 0 3.0G 0% /dev/shm