du: Estimate file space usage

du reports the amount of disk space used by the specified files and for each subdirectory (of directory arguments). Synopsis:

du [option]... [file]...

With no arguments, du reports the disk space for the current directory. The output is in 1024-byte units by default, unless the environment variable POSIXLY_CORRECT is set, in which case 512-byte blocks are used (unless `-k' is specified).

The program accepts the following options. Also see section Common options.

`-a'

`--all'

Show counts for all files, not just directories.

`-b'

`--bytes'

Print sizes in bytes, instead of kilobytes.

`-c'

`--total'

Print a grand total of all arguments after all arguments have been processed. This can be used to find out the total disk usage of a given set of files or directories.

`-D'

`--dereference-args'

Dereference symbolic links that are command line arguments. Does not affect other symbolic links. This is helpful for finding out the disk usage of directories, such as `/usr/tmp', which are often symbolic links.

`-h'

`--human-readable'

Append a size letter, such as `M' for megabytes, to each size.

`-k'

`--kilobytes'

Print sizes in kilobytes. This overrides the environment variable POSIXLY_CORRECT.

`-l'

`--count-links'

Count the size of all files, even if they have appeared already (as a hard link).

`-L'

`--dereference'

Dereference symbolic links (show the disk space used by the file or directory that the link points to instead of the space used by the link).

`-m'

`--megabytes'

Print sizes in megabyte (that 1,048,576 bytes) blocks.

`-s'

`--summarize'

Display only a total for each argument.

`-S'

`--separate-dirs'

Report the size of each directory separately, not including the sizes of subdirectories.

`-x'

`--one-file-system'

Skip directories that are on different filesystems from the one that the argument being processed is on.

On BSD systems, du reports sizes that are half the correct values for files that are NFS-mounted from HP-UX systems. On HP-UX systems, it reports sizes that are twice the correct values for files that are NFS-mounted from BSD systems. This is due to a flaw in HP-UX; it also affects the HP-UX du program.

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