DU(1) OpenBSD Reference Manual DU(1)NAMEdu - display disk usage statistics
SYNOPSISdu [-a | -s] [-chkrx] [-H | -L | -P] [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. Note that the system block usage is usually greater
than the actual size of the file. 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 an entry for each file in the file hierarchy.
-c Display the grand total after all the arguments have been
processed.
-H Symbolic links on the command line are followed. (Symbolic links
encountered in the tree traversal are not followed.)
-h "Human-readable" output. Use unit suffixes: Byte, Kilobyte,
Megabyte, Gigabyte, Terabyte, Petabyte, Exabyte in order to
reduce the number of digits to four or less.
-k By default, all sizes are reported in 512-byte block counts. The
-k option causes the numbers to be reported in kilobyte counts.
-L All symbolic links are followed.
-P No symbolic links are followed.
-r Generate messages about directories that cannot be read, files
that cannot be opened, and so on. This is the default.
-s Display only the grand total for the specified files.
-x File system mount points are not traversed.
It is not an error to specify more than one of the mutually exclusive
options -h and -k. Where more than one of these options is specified,
the last option given overrides the others.
du 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. The -H, -L, and -P options
override each other and the command's actions are determined by the last
one specified.
Files having multiple hard links are counted (and displayed) a single
time per du execution.
ENVIRONMENT
BLOCKSIZE Block counts will be displayed in units of this size block,
unless the -k or -h option is specified.
EXIT STATUS
The du utility exits 0 on success, and >0 if an error occurs.
SEE ALSOdf(1), fts(3), symlink(7), quot(8)STANDARDS
The du utility is compliant with the IEEE Std 1003.1-2008 (``POSIX'')
specification.
The flags [-chPr] are extensions to that specification.
The flag [-r] exists solely for conformance with X/Open Portability Guide
Issue 4 (``XPG4'').
HISTORY
A du command appeared in Version 3 AT&T UNIX.
OpenBSD 4.9 September 3, 2010 OpenBSD 4.9
