DU(1)			  BSD General Commands Manual			 DU(1)

NAME
     du — display disk usage statistics

SYNOPSIS
     du [-Aclnx] [-H | -L | -P] [-g | -h | -k | -m] [-a | -s | -d depth]
	[-B blocksize] [-I mask] [-t threshold] [file ...]

DESCRIPTION
     The du utility displays the file system block usage for each file argu‐
     ment and for each directory in the file hierarchy rooted in each direc‐
     tory 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 differ‐
	     ent from the -h, -k, -m and -g options or setting BLOCKSIZE and
	     gives an estimate of how much space the examined file hierarchy
	     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.

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

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

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

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

     -c      Display a grand total.

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

     -g      Display block counts in 1073741824-byte (1 GiB) blocks.

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

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

     -l      If a file has multiple hard links, count its size multiple 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 MiB) blocks.

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

     -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 X/Open Portability
	     Guide Issue 4 (“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.

     -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 option is specified, storage used by any symbolic links
     which are followed is not counted (or displayed).	The -H, -L and -P
     options override each other and the command's actions are determined by
     the last one specified.

     The -h, -k and -m options all override each other; the last one specified
     determines the block counts used.

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

EXAMPLES
     Show disk usage for all files in the current directory.  Output is in
     human-readable form:

	   # du -ah

     Summarize disk usage in the current directory:

	   # du -hs

     Summarize disk usage for a specific directory:

	   # du -hs /home

     Show name and size of all C files in a specific directory.  Also display
     a grand total at the end:

	   # du -ch /usr/src/sys/kern/*.c

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

HISTORY
     A du command appeared in Version 1 AT&T UNIX.

BSD			       November 4, 2012 			   BSD