7.2.1. The df command

The df is the simplest tool available to view disk usage. Simply type in df and you'll be shown disk usage for all your mounted filesystems in 1K blocks

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user@server:~> **df**
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/hda3              5242904    759692   4483212  15% /
tmpfs                   127876         8    127868   1% /dev/shm
/dev/hda1               127351     33047     87729  28% /boot
/dev/hda9             10485816     33508  10452308   1% /home
/dev/hda8              5242904    932468   4310436  18% /srv
/dev/hda7              3145816     32964   3112852   2% /tmp
/dev/hda5              5160416    474336   4423928  10% /usr
/dev/hda6              3145816    412132   2733684  14% /var

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You can also use the -h to see the output in "human-readable" format. This will be in K, Megs, or Gigs depending on the size of the filesystem. Alternately, you can also use the -B to specify block size.

In addition to space usage, you could use the -i option to view the number of used and available inodes.

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user@server:~> **df -i**
Filesystem            Inodes   IUsed   IFree IUse% Mounted on
/dev/hda3                  0       0       0    -  /
tmpfs                  31969       5   31964    1% /dev/shm
/dev/hda1              32912      47   32865    1% /boot
/dev/hda9                  0       0       0    -  /home
/dev/hda8                  0       0       0    -  /srv
/dev/hda7                  0       0       0    -  /tmp
/dev/hda5             656640   26651  629989    5% /usr
/dev/hda6                  0       0       0    -  /var

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