DU(1)

NAME
du - display disk usage statistics

SYNOPSIS
du [-A] [-H | -L | -P] [-a | -s | -d depth | -t threshold] [-c] [-l] [-h | -k | -m | -B blocksize] [-n] [-x] [-I mask] [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.

The options are as follows:

-A  Display the apparent size instead of the disk usage. This can be helpful when operating on compressed volumes or sparse files.

-B blocksize
    Calculate block counts in blocksize byte blocks. This is different from the -k, -m options or setting BLOCKSIZE and gives an estimate of how much space the examined file hierachy would require on a filesystem with the given blocksize. Unless in -A mode, blocksize is rounded up to the next multiple of 512.

-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 threshold
    Display only entries for which size exceeds threshold. If threshold is negative, display only entries for which size is less than the absolute value of threshold.

-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.

-l  If a file has multiple hard links, count its size many times. The default behavior of du is to count files with multiple hard links only once. When the -l option is specified, the hard link checks are disabled, and these files are counted (and displayed) as many times as they are found.

-m  Display block counts in 1048576-byte (1-Mbyte) blocks.

-n  Ignore files and directories with user “nodump” flag (UF_NODUMP) set.

-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.

ENVIRONMENT

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

SEE ALSO
df(1), chflags(2), fts(3), symlink(7), quot(8)

HISTORY
A du command appeared in AT&T UNIX.