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This article introduces the relevant knowledge of "how to check the size of specified folders and files under Linux". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Df command: view the free space and usage of all current file systems

Df can view the first-level folder size, usage ratio, file system and its mount point, but there is nothing it can do with files.

The code is as follows:

Df-lh

The parameter-h indicates that the output of "Human-readable" is used, that is, easy-to-read formats such as GB, MB, etc. are used in the file system size.

The first field (Filesystem) and the last field (Mounted on) of the above command output are the file system and its mount point, respectively. We can see that the partition / dev/sda1 is hung in the root directory.

The next four fields Size, Used, Avail, and Use% are the capacity, size used, remaining size, and percentage of the partition, respectively.

Du command: query disk usage space for files or folders

If there are many files and folders in the current directory, use the command without the parameter du to cycle through the space used by all files and folders. This is disadvantageous to see which place is too large, so you have to specify the number of layers in the deep directory, the parameter:-max-depth=, this is a very useful parameter! As follows, pay attention to the use of "*" to get the size of the file space.

The code is as follows:

[root@bsso yayu] # du-h-max-depth=1 work/testing

27M work/testing/logs

35M work/testing

[root@bsso yayu] # du-h-max-depth=1 work/testing/*

8.0K work/testing/func.php

27M work/testing/logs

8.1M work/testing/nohup.out

8.0K work/testing/testing_c.php

12K work/testing/testing_func_reg.php

8.0K work/testing/testing_get.php

8.0K work/testing/testing_g.php

8.0K work/testing/var.php

[root@bsso yayu] # du-h-max-depth=1 work/testing/logs/

27M work/testing/logs/

[root@bsso yayu] # du-h-max-depth=1 work/testing/logs/*

24K work/testing/logs/errdate.log_show.log

8.0K work/testing/logs/pertime_show.log

27M work/testing/logs/show.log

Check the size of the linux file directory and the number of files contained in the folder

The code is as follows:

Du-sh xmldb/ statistics total size

Du-sm * | sort-n / / count the current directory size and sort it

Du-sk * | sort-n

Du-sk * | grep guojf / / look at the size of a person

Du-m | cut-d "/"-f 2 / / look at the text before the second / character

Check how many files there are in this folder / * how many files

The code is as follows:

Du xmldb/

Du xmldb/* | wc-l

The difference between du and df

Add the size of du statistics file

Df statistics block usage

If a process opens a large file and the large file is dropped directly by rm or mv, du will update the statistics, df will not update the statistics, or the space will not be freed. Until the process of opening large files is dropped by Kill.

In this way, when the files under / var/spool/clientmqueue are deleted periodically, if the process is not killed, the space has not been released.

After killing the process with the following command, the system recovers.

Fuser-u / var/spool/clientmqueue

Ls command: view file size in K, M, G units

The code is as follows:

Ls

Ls-l

Ls-lh

Ll-h

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