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Du command

Disk management

The du command also looks at the usage space, but unlike the df command, whether the Linux du command looks at the space used by the file and directory disk, or whether it is different from the df command.

Grammar

Du [options] [File]

Option

-an or-all displays the size of individual files in the directory.

-b or-bytes displays the directory or file size in byte.

-c or-- total displays not only the size of individual directories or files, but also the sum of all directories or files.

-k or-- kilobytes output in KB (1024bytes).

-m or-- megabytes output in MB.

-s or-- summarize displays only the total and lists only the last plus value.

-h or-- human-readable is in the unit of KMagazine GetWord ("G"); to improve the readability of information.

-x or-- one-file-xystem is based on the file system at the beginning of the processing, and will be skipped in case of other different file system directories.

The source file size of the symbolic link specified in-L or-- dereference display options.

When-S or-- separate-dirs displays the size of an individual directory, it does not include the size of its subdirectories.

-X or-- exclude-from= is in the specified directory or file.

-- exclude= skips the specified directory or file.

-D or-- dereference-args displays the source file size of the specified symbolic link.

The parameters of-H or-- si are the same as-h, but the conversion unit of K _ ~ ~ M ~ G is 1000.

-l or-- count-links repeatedly calculates hardware-linked files.

Example

1. Display the space occupied by directories or files:

[root@localhost test] # du608. / test6308. / test44. / scf/lib4. / scf/service/deploy/product4. / scf/service/deploy/info12. / scf/service/deploy16. / scf/service4. / scf/doc4. / scf/bin32. / scf8. / test31288.

2. Only the directory size of the subdirectories under the current directory and the total size of the current directory are displayed, and the bottom 1288 is the total size of the current directory.

Displays the space occupied by the specified file:

The code is as follows:

[root@localhost test] # du log2012.log

300 log2012.log

3. View the space occupied by the specified directory:

[root@localhost test] # du scf4 scf/lib4 scf/service/deploy/product4 scf/service/deploy/info12 scf/service/deploy16 scf/service4 scf/doc4 scf/bin32 scf

4. Show the space occupied by multiple files:

[root@localhost test] # du log30.tar.gz log31.tar.gz4 log30.tar.gz4 log31.tar.gz shows only the size of the sum: [root@localhost test] # du-s1288. [root@localhost test] # du-s scf32 scf [root@localhost test] # cd. [root@localhost soft] # du-s test1288 test

Here are some supplementary materials for scholars:

Description

Du is an abbreviation for disk usage. It is mainly used to summarize the disk size of each file and to count multiple files.

Related command

Df

Simple example

I set up two files

The code is as follows:

$du-- help > du.txt

$mandu > mandu.txt

1. View file size

$du du.txt mandu.txt

As shown in the figure:

Explanation: print the size of both du.txt and mandu.txt (default unit is byte bytes)

two。 View the file size in a directory

$du-a tmp/

As shown in the figure:

Explanation: the tmp/ in the picture shows that the directory size is 84 bits.

3. Count the size of several files

$du-c du.txt mandu.txt

Help of du

Usage: du [option]. [file].

Or: du [options]... -- files0-from=F

Summarize the disk usage for each, and take the total amount for the directory.

The parameters that the long option must use are also necessary when using the short option.

Description

-a,-- all prints all files, including directories

-- apparent-size prints the size of visible content, which is more accurate than the du command. Although apparent size is usually smaller, it may be larger than du due to hard disk fragmentation and other reasons

-B,-- block-size=SIZE users define their own units (bforce kpenm)

-b,-- bytes unit is 1byte equivalent to `--apparent-size-- block-size=1'

-c,-- total statistics size

-D,-- dereference-args dereference FILEs that are symbolic links is used for soft connection files

-- files0-from=F counts the file size. The file to be counted ends with NUL and is specified in file F

-H unit 1000 instead of 1024; equivalent to-- dereference-args (- D)

-h,-- human-readable prints as readable (e.g.1K 234m 2G)

-- si like-h, but use powers of 1000 not 1024

-k like-- block-size=1K

-l,-- count-links counts many times if it is a hard link

-m like-- block-size=1M

-L,-- dereference view all soft connections

-P,-- no-dereference does not view soft connection files (default)

-0, (zero here)-- null replaces a new line with 0 bytes for each output line (that is, when multiple files are output at the same time)

-S,-- separate-dirs does not include subdirectory size

-s,-- summarize only shows the total size (- c will have some other statistics here)

-x,-- one-file-system skips branches of other file systems

-X FILE,-- exclude-from=FILE excludes files that conform to the regular expression FILE.

-- exclude=PATTERN Exclude files that match PATTERN.

-- max-depth=N prints all files under the directory (or file, use the command-- all), only the directory depth is less than or equal to the parameter command N;-- max-depth=0 equals-- summarize, that is, all

-- time displays the last modification time of all files, including the

-- time=WORD

Replace the output showing the last modified time with the following words (WROD): atime, access, use, ctime or status

-- time-style=STYLE

Show times using style STYLE:

Full-iso, long-iso, iso, + FORMAT

FORMAT is interpreted like `date'

-- help displays this help and exits

-- version outputs version information and exits

[size] can be the following units (units can be preceded by integers):

KB 1000 and K 1024 MB 1000000 M 1048576, and G, T, P, E, Z, Y

Explain help

About-0 (zero here)

Look at the difference:

$du-a. /

As shown in the figure:

$du-a0. /

Add-0, and the effect is as shown in the figure:

Example:

1.$du-b du.txt

The file is too small, you can use-m,-k, or even define the size yourself

The effect is as shown in the figure:

2.$du-ak dir | sort-nrk 1 | head

-a lists all-k is sorted in 1kb units, sorted by sort, the top 10 printed by head, and dir is the directory

As shown in the figure:

Wrap up

To explain briefly here, if you copy the commands in the text directly, notice that the symbol "-" has actually been changed and needs to be modified.

Thank you for reading! This is the end of this article on "how to use du commands in linux". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, you can share it for more people to see!

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