du
Disk Usage – report the amount of disk space used by the specified files and for each subdirectory.
Syntax
du [options]… [file]…
With no arguments, `du’ reports the disk space for the current directory. Normally the disk space is printed in units of 1024 bytes, but this can be overridden
OPTIONS
`-a’
`–all’
Show counts for all files, not just directories.
`-b’
`–bytes’
Print sizes in bytes, overriding the default block size (*note
Block size::).
`-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.
Powers of 1024 are used, not 1000; `M’ stands for 1,048,576 bytes.
Use the `-H’ or `–si’ option if you prefer powers of 1000.
`-H’
`–si’
Append a size letter such as `M’ for megabytes to each size. (SI
is the International System of Units, which defines these letters
as prefixes.) Powers of 1000 are used, not 1024; `M’ stands for
1,000,000 bytes. Use the `-h’ or `–human-readable’ option if you
prefer powers of 1024.
`-k’
`–kilobytes’
Print sizes in 1024-byte blocks, overriding the default block size
(*note Block size::).
`-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).
`–max-depth=DEPTH’
Show the total for each directory (and file if -all) that is at
most MAX_DEPTH levels down from the root of the hierarchy. The
root is at level 0, so `du –max-depth=0′ is equivalent to `du -s’.
`-m’
`–megabytes’
Print sizes in megabyte (that is, 1,048,576-byte) 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.
`–exclude=PAT’
When recursing, skip subdirectories or files matching PAT. For
example, `du –exclude=’*.o” excludes files whose names end in
`.o’.
`-X FILE’
`–exclude-from=FILE’
Like `–exclude’, except take the patterns to exclude from FILE,
one per line. If FILE is `-’, take the patterns from standard
input.
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.
Example
List the total files sizes for everything 1 directory (or less) below the currrent directory ( . )
$ du -hc –max-depth=1 .
400M ./data1
1.0G ./data2
1.3G .
1.3G total
Related:
ls – List information about FILEs
Equivalent Windows command: DIRUSE – resource kit utility to show size of multiple subfolders.
