du (abbreviated from disk usage) is a Unix computer program to display the amount of disk space used under a particular directory or files on a file system.

du counts the disk space by walking the directory tree. As such, the amount of space on a file system shown by du may vary from that shown by df (Unix) if files have been deleted but their blocks not yet freed.

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

The du utility first appeared in version 1 of AT&T UNIX.

= Example =

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

$du -k /seclog 4 /seclog/lost+found 132 /seclog/backup/aix7 136 /seclog/backup 44044 /seclog/temp 439264 /seclog

= External links =