28.10. File Systems and Their Usage: mount, df, and du

The command mount shows which file system (device and type) is mounted at which mount point:

$ mount
/dev/hdb2 on / type ext2 (rw)
proc on /proc type proc (rw)
devpts on /dev/pts type devpts (rw,mode=0620,gid=5)
/dev/hda1 on /data type ext2 (rw)
shmfs on /dev/shm type shm (rw)
usbdevfs on /proc/bus/usb type usbdevfs (rw)
automount(pid1012) on /suse type autofs \
totan:/real-home/jj on /suse/jj type nfs \

Obtain information about total usage of the file systems with the command df. The parameter -h (or --human-readable) transforms the output into a form understandable for common users.

$ df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/hdb2             7.4G  5.1G  2.0G  73% /
/dev/hda1              74G  5.8G   65G   9% /data
shmfs                 252M     0  252M   0% /dev/shm
totan:/real-home/jj   350G  324G   27G  93% /suse/jj

Users of the NFS file server totan should clear their home directory immediately.

Display the total size of all the files in a given directory and its subdirectories with the command du. The parameter -s suppresses the output of detailed information. -h again transforms the data into a form that ordinary people can understand. With this command:

$ du -sh ~
361M    /suse/jj

see how much space your own home directory occupies.