NAME
du —
display disk usage
statistics
SYNOPSIS
du |
[-H | -L |
-P] [-a |
-d depth |
-s]
[-cghikmnrx]
[file ...] |
DESCRIPTION
The
du utility displays the file system usage for each file
argument and for each directory in the file hierarchy rooted in each directory
argument. If no file is specified, the block usage of the hierarchy rooted in
the current directory is displayed.
The options are as follows:
-
-
- -H
- Symbolic links on the command line are followed. (Symbolic
links encountered in the tree traversal are not followed.)
-
-
- -L
- All symbolic links are followed.
-
-
- -P
- No symbolic links are followed.
-
-
- -a
- Display an entry for each file in the file hierarchy.
-
-
- -c
- Display the grand total after all the arguments have been
processed.
-
-
- -d
- Display an entry files and directories
depth directories deep.
-
-
- -g
- If the -g flag is specified, the number
displayed is the number of gigabyte (1024*1024*1024 bytes) blocks.
-
-
- -h
- If the -h flag is specified, the numbers
will be displayed in "human-readable" format. Use unit suffixes:
B (Byte), K (Kilobyte), M (Megabyte), G (Gigabyte), T (Terabyte) and P
(Petabyte).
-
-
- -i
- Output inode usage instead of blocks. All
"human-readable" options are ignored.
-
-
- -k
- By default, du displays the number of
blocks as returned by the
stat(2) system call, i.e.
512-byte blocks. If the -k flag is specified, the number
displayed is the number of kilobyte (1024 bytes) blocks. Partial numbers
of blocks are rounded up.
-
-
- -m
- If the -m flag is specified, the number
displayed is the number of megabyte (1024*1024 bytes) blocks.
-
-
- -n
- Ignore files and directories with user “nodump”
flag (
UF_NODUMP
) set.
-
-
- -r
- Generate warning messages about directories that cannot be
read. This is the default behaviour.
-
-
- -s
- Display only the grand total for the specified files.
-
-
- -x
- Filesystem mount points are not traversed.
du counts the storage used by symbolic links and not the files
they reference unless the
-H or
-L option
is specified. If either the
-H or
-L
options are specified, storage used by any symbolic links which are followed
is not counted or displayed. The
-H,
-L
and
-P options override each other and the command's actions
are determined by the last one specified.
Files having multiple hard links are counted (and displayed) a single time per
du execution.
ENVIRONMENT
-
-
BLOCKSIZE
- If the environment variable
BLOCKSIZE
is set, and the -g,
-h, -k, and -m
options are not specified, the block counts will be displayed in units of
that size block.
EXIT STATUS
The
du utility exits 0 on success, and >0 if an
error occurs.
SEE ALSO
df(1),
chflags(2),
fts(3),
getbsize(3),
symlink(7),
quot(8)
HISTORY
A
du command appeared in
Version 6
AT&T UNIX.