DU(1)

NAME
du - display disk usage statistics

SYNOPSIS
du [-H | -L | -P] [-I mask] [-a | -s | -d depth] [-c] [-h | -k] [-x] [-t] [file ...]

DESCRIPTION
The du utility displays the file system block usage for each file argument and for each directory in the file hierarchy rooted in each directory argument. If no file is specified, the block usage of the hierarchy rooted in the current directory is displayed. If the -k flag is specified, the number of 1024-byte blocks used by the file is displayed, otherwise getbsize(3) is used to determine the preferred block size. Partial numbers of blocks are rounded up.

The options are as follows:

-H  Symbolic links on the command line are followed, symbolic links in file hierarchies are not followed.

-L  Symbolic links on the command line and in file hierarchies are followed.

-I mask
    Ignore files and directories matching the specified mask.

-P  No symbolic links are followed. This is the default.

-a  Display an entry for each file in a file hierarchy.

-h  "Human-readable" output. Use unit suffixes: Byte, Kilobyte, Megabyte, Gigabyte, Terabyte and Petabyte

-r  Generate messages about directories that cannot be read, files that cannot be opened, and so on. This is the default case. This option exists solely for conformance with xpg4.

-s  Display an entry for each specified file. (Equivalent to -d 0)

-t  Calculate the apparent size based on the file size (st_size) instead of the actual media space used based on st_blkcnt. This is meant to give the caller an idea of how much data is present in actual transmittable bytes if it were to be copied or sent elsewhere.

    To make this calculation du uses st_size and assumes a media blocking granularity of 512 bytes. Any holes present in the file are counted as transmittable data.

-d depth
    Display an entry for all files and directories depth directories deep.

-c  Display a grand total.

-k  Display block counts in 1024-byte (1-Kbyte) blocks.

-x  File system mount points are not traversed.

The du utility counts the storage used by symbolic links and not the files they reference unless the -H or -L option is specified. If either the -H or -L options are specified, storage used by any symbolic links which are followed is not counted or displayed.

Files having multiple hard links are counted (and displayed) a single time per du execution.

ENVIRONMENT

BLOCKSIZE
    If the environment variable BLOCKSIZE is set, and the -k option is not specified, the block counts will be displayed in units of that size block. If BLOCKSIZE is not set, and the -k option is not specified, the block counts will be displayed in 512-byte blocks.

SEE ALSO
df(1), fts(3), symlink(7), quot(8)

HISTORY
A du command appeared in AT&T UNIX.