A Windows commandline version of this program is part of Sysinternals suite by Mark Russinovich.

The version of du bundled in GNU coreutils was written by Torbjorn Granlund, David MacKenzie, Paul Eggert, and Jim Meyering.

[2] By default, the Single UNIX Specification (SUS) specifies that du is to display the file space allocated to each file and directory contained in the current directory.

For example, BSD and GNU du specify a -h option, displaying disk usage in a format easier to read by the user, adding units with the appropriate SI prefix (e.g. 10 MB).

Sum of directories (-s) in kilobytes (-k): Sum of directories (-s) in human-readable format (-h : Byte, Kilobyte, Megabyte, Gigabyte, Terabyte and Petabyte): disk usage of all subdirectories and files including hidden files within the current directory (sorted by filesize) : disk usage of all subdirectories and files including hidden files within the current directory (sorted by reverse filesize) : The weight (size) of each subdirectory under the current directory (-d 1) with a sum total at the end (-c) all displayed in human-readable format (-h): or with du from GNU: The weight (size) of subdirectories under the root directory (-d 1, trailing /) with a sum total at the end (-c), all displayed in human-readable format (-h) without traversing into other filesystems (-x).