du - summarize disk usage
/usr/bin/du [-dorx] [-a | -s] [-h | -k | -m] [-H | -L] [file ...]
/usr/xpg4/bin/du [-dorx] [-a | -s] [-h | -k | -m] [-H | -L] [file ...]
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.
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 for /usr/bin/du and /usr/xpg4/bin/du:
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.
The following operand is supported:
The output from du consists of the amount of the space allocated to a file and the name of the file.
See largefile(5) for the description of the behavior of du when encountering files greater than or equal to 2 Gbyte ( 2^31 bytes).
See environ(5) for descriptions of the following environment variables that affect the execution of du: LANG, LC_ALL, LC_CTYPE, LC_MESSAGES, and NLSPATH.
The following exit values are returned:
See attributes(5) for descriptions of the following attributes:
ls(1), stat(2), attributes(5), environ(5), fsattr(5), largefile(5), standards(5)
System Administration Guide: Basic Administration
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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Created 1996-2023 by Maxim Chirkov
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