df (abbreviated from disk free) is a Unix computer program to display the amount of disk space used and available on a system. Typically, df collects its data by reading the Mtab file and directly polling listed file systems for statistics.

In Linux, it is a part of the GNU Coreutils package.

According to the BSD manual page for df, it originated in Version 3 of AT&T s UNIX operating system.

=Example=

The -k flag will show the sizes in 1K blocks, rather than the default of 512 byte blocks.

$df -k Filesystem 1024-blocks Free %Used Iused %Iused Mounted on /dev/hd4 32768 16016 52% 2271 14% / /dev/hd2 4587520 1889420 59% 37791 4% /usr /dev/hd9var 65536 12032 82% 518 4% /var /dev/hd3 819200 637832 23% 1829 1% /tmp /dev/hd1 524288 395848 25% 421 1% /home /proc - - - - - /proc /dev/hd10opt 65536 26004 61% 654 4% /opt

= External links =