du(1M) manual page
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du - summarize disk usage
/usr/bin/du [ -adkr ] [ -s | -o ]
[ file... ]
/usr/xpg4/bin/du [ -a | -s ] [ -krx ] [ file... ]
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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.
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.
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.
The following
options are supported by /usr/bin/du and /usr/xpg4/bin/du:
- -k
- Write the
files sizes in units of 1024 bytes, rather than the default 512-byte units.
- -s
- Instead of the default output, report only the total sum for each of
the specified files.
The following options are supported by /usr/bin/du
only: -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.
- -d
- Do not cross filesystem boundaries. "du -d /" would report usage only
on the root partition, for example.
- -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 messages about directories that cannot be read, files
that cannot be opened, and so forth, rather than being silent (the default).
The following options are supported by /usr/xpg4/bin/du
only:
- -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. -r By default, generate messages about directories
that cannot be read, files that cannot be opened, and so forth.
- -x
- When evaluating
file sizes, evaluate only those files that have the same device as the
file specified by the file operand.
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.
The output from du consists
of the amount of the space allocated to a file and the name of the file.
See environ(5)
for descriptions of the following environment
variables that affect the execution of du: LC_CTYPE, LC_MESSAGES, and NLSPATH.
The following exit values are returned:
- Successful completion.
- >0
- An error occurred.
ls(1)
, stat(2)
, environ(5)
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.
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