Df (Unix)

From Free net encyclopedia

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.

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Example

The -k flag will show the sizes in 1K blocks, rather than the default of 512 byte blocks (the GNU version of df shows the sizes in 1K blocks by default -- at least since March 2000, unless the environment variable POSIXLY_CORRECT is set, in which case 512-byte blocks are used).

$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

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