A Linux command a day (1): ls command

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Devops
by Admin/ on 13 Sep 2021

A Linux command a day (1): ls command


The Linux mkdir command is used to create a directory with the specified name. It requires the user creating the directory to have write permission in the current directory, and the specified directory name cannot be an existing directory in the current directory.

1. Command Format

mkdir [option] directory

2. Command function

The mkdir command enables you to create a folder or directory named with DirName (the specified file name) in the specified location. The user who wants to create the folder or directory must have write access to the parent folder of the created folder.

Also, the created folder (directory) cannot have the same name as the file name in its parent directory (i.e., parent folder), i.e., it cannot have the same name in the same directory (case-sensitive).

3. Command parameters

 -m, --mode=mode, set permissions <mode> (similar to chmod) instead of rwxrwxrwx minus umask

 -p, --parents can be a path name. If some directories in the path do not exist yet, adding this option will automatically create those that do not exist yet, i.e. multiple directories can be created at once.

 -v, --verbose show information every time a new directory is created  
   --help displays this help and exits  
   --version output version information and exit`

4. Command examples

Example 1: Create an empty directory

Command.

mkdir test1

Output.

[root@localhost soft]# cd test  
[root@localhost test]# mkdir test1  
[root@localhost test]# ll

Total 4

drwxr-xr-x 2 root root 4096 10-25 17:42 test1  
[root@localhost test]#  

Example 2: Recursively create multiple directories

Command.

mkdir -p test2/test22

Output.

[root@localhost test]# mkdir -p test2/test22  
[root@localhost test]# ll

Total 8

drwxr-xr-x 2 root root 4096 10-25 17:42 test1  
drwxr-xr-x 3 root root 4096 10-25 17:44 test2

[root@localhost test]# cd test2/  
[root@localhost test2]# ll

Total 4

drwxr-xr-x 2 root root 4096 10-25 17:44 test22  
[root@localhost test2]#  

Example 3: Create a directory with permission 777

Command.

mkdir -m 777 test3

Output.

[root@localhost test]# mkdir -m 777 test3  
[root@localhost test]# ll

Total 12

drwxr-xr-x 2 root root 4096 10-25 17:42 test1  
drwxr-xr-x 3 root root 4096 10-25 17:44 test2  
drwxrwxrwx 2 root root 4096 10-25 17:46 test3  
[root@localhost test]#  

Note: test3’s permissions are rwxrwxrwx

Example 4: Create a new directory and display the information

Command.

mkdir -v test4

Output.

[root@localhost test]# mkdir -v test4  
mkdir: created directory "test4"

[root@localhost test]# mkdir -vp test5/test5-1  
mkdir: directory "test5" created  
mkdir: directory "test5/test5-1" created

[root@localhost test]#

Example 5: A command to create the directory structure of a project

Reference: http://www.ibm.com/developerworks/cn/aix/library/au-badunixhabits.html

Command.

mkdir -vp scf/{lib/,bin/,doc/{info,product},logs/{info,product},service/deploy/{info,product}}

Output.

[root@localhost test]# mkdir -vp scf/{lib/,bin/,doc/{info,product},logs/{info,product},service/deploy/{info,product}}

mkdir: Created directory "scf"  
mkdir: directory "scf/lib" created  
mkdir: directory "scf/bin" created  
mkdir: directory "scf/doc" created

mkdir: directory "scf/doc/info" created  
mkdir: directory "scf/doc/product" created

mkdir: directory "scf/logs" created  
mkdir: directory "scf/logs/info" created  
mkdir: directory "scf/logs/product" created

mkdir: directory "scf/service" created  
mkdir: directory "scf/service/deploy" created  
mkdir: directory "scf/service/deploy/info" created  
mkdir: directory "scf/service/deploy/product" created

[root@localhost test]# tree scf/

scf/  
|-- lib  
|-- bin  
|-- doc  
|-- info  
|-- product  
|-- logs  
|-- info  
-- product  
|-- service  
|-- deploy  
|-- info  
|-- product

12 directories, 0 files

[root@localhost test]#


Reference

www.cnblogs.com/peida/archive/2012/10/25/2738271.html

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