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What are the two disk storage related commands in Linux? I believe many inexperienced people don't know what to do about it. Therefore, this article summarizes the causes and solutions of the problem. Through this article, I hope you can solve this problem.

Du command

The Linux 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.

* * 1. Format of the command:

Du [options] [File]

* * 2.commands * command function:

Displays the disk usage space for each file and directory.

* * 3.arguments * command parameters:

-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 units.

-s or-summarize displays only the totals and lists only the last plus values.

-h or-human-readable is in the unit of KMagazine G to improve the readability of the 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.

-L or-dereference displays the source file size of the symbolic link specified in the option.

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

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

* * 4. Examples:

Example 1: displays the space occupied by a directory or file

Command:

Du

Output:

[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. [root@localhost test] #

Description:

Only the directory size of the subdirectories below 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

Example 2: displays the space occupied by the specified file

Command:

Du log2012.log

Output:

[root@localhost test] # du log2012.log 300 log2012.log [root@localhost test] #

Description:

* instance 3: view the * space occupied by the specified directory *

Command:

Du scf

Output:

[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 [root@localhost test] #

Description:

Example 4: show the space occupied by multiple files

Command:

Du log30.tar.gz log31.tar.gz

Output:

[root@localhost test] # du log30.tar.gz log31.tar.gz 4 log30.tar.gz4 log31.tar.gz [root@localhost test] #

Description:

Example 5: only the size of the sum is displayed

Command:

Du-s

Output:

[root@localhost test] # du-s1288. [root@localhost test] # du-s scf32 scf [root@localhost test] # cd. [root@localhost soft] # du-s test1288 test [root@localhost soft] #

Description:

Example 6: easy-to-read format display

Command:

Du-h test

Output:

[root@localhost soft] # du-h test608K test/test6308K test/test44.0K test/scf/lib4.0K test/scf/service/deploy/product4.0K test/scf/service/deploy/info12K test/scf/service/deploy16K test/scf/service4.0K test/scf/doc4.0K test/scf/bin32K test/scf8.0K test/test31.3M test [root@localhost soft] #

Description:

Example 7: both files and directories are displayed

Command:

Output:

[root@localhost soft] # du-ah test4.0K test/log31.tar.gz4.0K test/test13.tar.gz0 test/linklog.log0 test/test6/log2014.log300K test/test6/linklog.log0 test/test6/log2015.log4.0K test/test6/log2013.log300K test/test6/log2012.log0 test/test6/log2017.log0 test/test6/log2016.log608K test/test60 test/log2015.log0 Test/test4/log2014.log4.0K test/test4/log2013.log300K test/test4/log2012.log308K test/test44.0K test/scf/lib4.0K test/scf/service/deploy/product4.0K test/scf/service/deploy/info12K test/scf/service/deploy16K test/scf/service4.0K test/scf/doc4.0K test/scf/bin32K test/scf4.0K test/log2013.log300K test/log2012.log0 test/log2017.log0 Test/log2016.log4.0K test/log30.tar.gz4.0K test/log.tar.bz24.0K test/log.tar.gz0 test/test3/log2014.log4.0K test/test3/log2013.log8.0K test/test34.0K test/scf.tar.gz1.3M test [root@localhost soft] #

Description:

* * instance 8 virtual directory * shows the amount of disk space occupied by several files or directories, and counts the sum of them

Command:

Du-c log30.tar.gz log31.tar.gz

Output:

[root@localhost test] # du-c log30.tar.gz log31.tar.gz 4 log30.tar.gz4 log31.tar.gz8 Total [root@localhost test] #

Description:

With the-c option added, du not only displays the amount of disk space occupied by each of the two directories, but also sums them up on the last line.

Example 9: sort by space size

Command:

Du | sort-nr | more

Output:

[root@localhost test] # du | sort-nr | more1288. 608. / test6308. / test432. / scf16. / scf/service12. / scf/service/deploy8. / scf/service/deploy/product4. / scf/service/deploy/info4. / scf/lib4. / scf/doc4. / scf/bin [root@localhost test] #

Description:

Example 10: output the space used by each subdirectory under the current directory

Command:

Du-h-max-depth=1

Output:

[root@localhost test] # du-h-max-depth=1608K. / test6308K. / test432K. / scf8.0K. / test31.3M. [root@localhost test] #

Description:

--

Df command

The function of the df command in linux is to check the disk space usage of the file system of the linux server. You can use this command to get information such as how much space the hard disk is occupied and how much space is left.

* * 1. Format of the command:

Df [options] [File]

* * 2.commands * command function:

Displays the free space for the specified disk file. If no file name is specified, the free space of all currently mounted file systems will be displayed. By default, disk space is displayed in 1KB unless the environment variable POSIXLY_CORRECT is specified.

* * 3.arguments * command parameters:

Required parameters:

-a list of all file systems

-h easy reading mode display

-H equals "- h", but the formula is 1K=1000, not 1K=1024.

-I display inode information

-k block is 1024 bytes

-l displays only the local file system

-m block is 1048576 bytes

-no-sync ignores the sync command

-P output format is POSIX

-sync executes the sync command before getting the disk information

-T file system type

Select parameters:

-block-size= specifies the block size

-t displays only disk information for the selected file system

-x does not display disk information for the selected file system

-help displays help information

-version displays version information

* * 4. Examples:

Example 1: display disk usage

Command:

Df

Output:

[root@liangxu] # df File system 1K-Block used used% mount point / dev/sda7 19840892 890896 17925856 5% / / dev/sda9 203727156 112797500 8041391259% / opt/dev/sda8 4956284 570080 4130372 13% / var/dev/sda6 19840892 1977568 16839184 11% / usr/dev/sda3 988116 23880 913232 / boottmpfs 16473212 0 16473212 / dev/shm

Description:

The first column of the output list of the df command in linux is the pathname of the device file corresponding to the file system (usually the partition on the hard disk); the second column shows the number of data blocks (1024 bytes) contained in the partition; and the third and fourth columns represent the number of used and available data blocks, respectively. Users may find it strange that the sum of the number of blocks in column 3 and 4 is not equal to the number of blocks in column 2. This is because each partition by default leaves a small amount of space for the system administrator to use. Even if the normal user space is full, the administrator can still log in and leave the workspace needed to solve the problem. The Use% column in the list represents the percentage of normal user space used, and even if this number reaches 100%, the partition still has space for the system administrator. Finally, the Mounted on column represents the mount point of the file system.

Example 2: display disk usage in inode mode

Command:

Df-I

Output:

[root@liangxu] # df-I file system Inode (I) used (I) available (I)% mount point / dev/sda7 5124480 5560 5118920 1% / / dev/sda9 52592640 50519 52542121 1% / opt/dev/sda8 1280000 8799 12712011% / var/dev/sda6 5124480 80163 50443172% / usr/dev / sda3 255232 34 255198 1% / boottmpfs 4118303 1 4118302 1% / dev/shm

Description:

* * instance 3 virtual disk displays the specified type of disk

Command:

Df-t ext3

Output:

[root@liangxu] # df-t ext3 File system 1K-Block used used% mount point / dev/sda7 19840892 890896 17925856 / / dev/sda9 203727156 93089700 100121712 49% / opt/dev/sda8 4956284 570104 4130348 13% / var/dev/sda6 198408968 1977568 16839184 11% / usr/dev / sda3 988116 23880 913232 3% / boot

Description:

Example 4: list the I node usage of each file system

Command:

Df-ia

Output:

[root@liangxu] # df-ia file system Inode (I) used (I) available (I)% mount point / dev/sda7 5124480 5560 5118920 / proc 5124480-/ procsysfs 000-/ sysdevpts 52542121-/ dev/pts/dev/sda9 52592640 50519 1% / opt/dev/sda8 1280000 879912712011% / var/dev/sda6 5124480 80163 50443172% / usr/dev/sda3 255232 34 255198 1% / boottmpfs 4118303 1 41183021% / dev/shmnone 0 000-/ proc/sys/fs/binfmt_misc

Description:

* * instance 5: virtual * lists the type of file system

Command:

Df-T

Output:

Root@liangxu] # df-T File system Type 1K-Block used used mount point / dev/sda7 ext3 19840892 890896 17925856 / / dev/sda9 ext3 203727156 93175692 100035720 49% / opt/dev/sda8 ext3 4956284 570104 4130348 13% / var/dev/sda6 ext3 198408892 1977568 16839184 11% / usr/dev/sda3 ext3 988116 23880 913232 / boottmpfs tmpfs 16473212 0 16473212 / dev/shm

Description:

* instance 6VR * shows the current disk space and usage in a more readable way

Command:

Output:

[root@liangxu] # df-h File system capacity used used mount point / dev/sda7 19G 871M 18G 5% / / dev/sda9 195G 89G 96G 49% / opt/dev/sda8 4.8G 557M 4.0G 13% / var/dev/sda6 19G 1.9G 17G 11% / usr/dev / sda3 965M 24M 892m 3% / boottmpfs 16G 0 16G 0% / dev/shm [root@liangxu] # df-H File system capacity available used mount point / dev/sda7 21G 913m 19G 5% / / dev/sda9 209G 96G 103G 49% / opt/ Dev/sda8 5.1G 584M 4.3G 13% / var/dev/sda6 21G 2.1G 2.1G 18G 11% / usr/dev/sda3 1.1G 25m 936m 3% / boottmpfs 17G 017G 0% / dev/shm [root@liangxu] # df-lh file system capacity is available % mount point / dev/sda7 19G 871M 18G 5% / dev/sda9 195G 89G 96G 49% / opt/dev/sda8 4.8G 557M 4.0G 13% / var/dev/sda6 19G 1.9G 17G 11% / usr/dev/sda3 965M 24M 892m 3% / boottmpfs 16G 0 16G 0% / dev/shm [root@liangxu] # df-k File system 1K-Block used used% mount point / dev/sda7 19840892 890896 17925856 / / dev/sda9 203727156 93292572 99918840 49% / opt/dev/sda8 4956284 570188 4130264 13% / var/dev/sda6 19840892 1977568 16839184 11% / usr/dev/sda3 988116 23880 913232 3% / boottmpfs 16473212 0 164732120% / dev/shm

Description:

-h more current disk space and usage are displayed in a more readable manner

The-h parameter above the-H root is the same, but when rooting, use 1000 instead of 1024 for capacity conversion

-k displays disk usage in units

-l shows the disk space utilization of the local partition. If the server nfs the disk of the remote server, then add-l to the df and the system displays the result after filtering the nsf drive.

-I shows the usage of inode. Linux uses a pointer-like way to manage disk space mapping. This is also a key application.

What is Linux system Linux is a free-to-use and free-spread UNIX-like operating system, is a POSIX-based multi-user, multi-task, multi-threaded and multi-CPU operating system, using Linux can run major Unix tools, applications and network protocols.

After reading the above, have you mastered what are the two disk storage related commands in Linux? If you want to learn more skills or want to know more about it, you are welcome to follow the industry information channel, thank you for reading!

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