DU(1) User Commands DU(1)

NAME

du - summarize disk usage

SYNOPSIS

/usr/bin/du [-Adorx] [-a | -s] [-h | -k | -m] [-H | -L]
[file ...]


/usr/xpg4/bin/du [-Adorx] [-a | -s] [-h | -k | -m] [-H | -L]
[file ...]

DESCRIPTION

The du utility writes to standard output the size of the file space
allocated to, and the size of the file space allocated to each
subdirectory of, the file hierarchy rooted in each of the specified
files. The size of the file space allocated to a file of type directory
is defined as the sum total of space allocated to all files in the file
hierarchy rooted in the directory plus the space allocated to the
directory itself. This sum will include the space allocated to any
extended attributes encountered.

Files with multiple links will be counted and written for only one entry.
The directory entry that is selected in the report is unspecified. By
default, file sizes are written in 512-byte units, rounded up to the next
512-byte unit.

/usr/xpg4/bin/du
When du cannot obtain file attributes or read directories (see stat(2)),
it will report an error condition and the final exit status will be
affected.

OPTIONS

The following options are supported for /usr/bin/du and /usr/xpg4/bin/du:

-a
In addition to the default output, report the size of each file not
of type directory in the file hierarchy rooted in the specified
file. Regardless of the presence of the -a option, non-directories
given as file operands will always be listed.


-A
Tally file size using the apparent size of the file instead of the
disk blocks it occupies. This option is useful when operating on
file systems which employ compression or in the presence of sparse
files.


-d
Do not cross filesystem boundaries. For example, the command, du -d
/ reports usage only on the root partition.


-h
All sizes are scaled to a human readable format, for example, 14K,
234M, 2.7G, or 3.0T. Scaling is done by repetitively dividing by
1024.


-H
If a symbolic link to a directory is specified on the command line,
process the symbolic link by using the directory which the symbolic
link references, rather than the link itself.


-k
Write the files sizes in units of 1024 bytes, rather than the
default 512-byte units.


-L
Process symbolic links by using the file or directory which the
symbolic link references, rather than the link itself.


-m
Write the files sizes in units of megabytes, rather than the
default 512-byte units.


-o
Do not add child directories' usage to a parent's total. Without
this option, the usage listed for a particular directory is the
space taken by the files in that directory, as well as the files in
all directories beneath it. This option does nothing if -s is used.


-r
Generate diagnostic messages about unreadable directories and files
whose status cannot be obtained. /usr/bin/du is silent if these
conditions arise and -r is not specified. /usr/xpg4/bin/du acts as
though -r is always specified.


-s
Instead of the default output, report only the total sum for each
of the specified files.


-x
When evaluating file sizes, evaluate only those files that have the
same device as the file specified by the file operand.


Specifying more than one of the options in the mutually exclusive pair,
-H and -L, is not considered an error. The last option specified
determines the output format.


Specifying more than one of the options in the mutually exclusive set of
options -h, -k, and -m is not considered an error. The last option
specified determines the output format.

OPERANDS

The following operand is supported:

file
The path name of a file whose size is to be written. If no file
is specified, the current directory is used.

OUTPUT

The output from du consists of the amount of the space allocated to a
file and the name of the file.

USAGE

See largefile(7) for the description of the behavior of du when
encountering files greater than or equal to 2 Gbyte ( 2^31 bytes).

ENVIRONMENT VARIABLES

See environ(7) for descriptions of the following environment variables
that affect the execution of du: LANG, LC_ALL, LC_CTYPE, LC_MESSAGES, and
NLSPATH.

EXIT STATUS

The following exit values are returned:

0
Successful completion.

>0
An error occurred.

ATTRIBUTES

See attributes(7) for descriptions of the following attributes:

/usr/bin/du

+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|CSI | Enabled |
+--------------------+-----------------+
|Interface Stability | Stable |
+--------------------+-----------------+

/usr/xpg4/bin/du

+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|CSI | Enabled |
+--------------------+-----------------+
|Interface Stability | Standard |
+--------------------+-----------------+

SEE ALSO

ls(1), stat(2), attributes(7), environ(7), fsattr(7), largefile(7),
standards(7)

System Administration Guide: Basic Administration

NOTES

A file with two or more links is counted only once. If, however, there
are links between files in different directories where the directories
are on separate branches of the file system hierarchy, du will count the
excess files more than once.

Files containing holes will result in an incorrect block count. In this
case, one may use the -A option to report file sizes by their apparent
size instead.

March 14, 2017 DU(1)