Linux most commonly used command combat

1. Change the name of the machine:

Vim/etc/hostname

Master

Modify the machine name in the file for the name we want (equivalent to the domain name)

Can be closed by shutdown-h now

2. View current machine IP:

Ifconfig

3.vim/etc/hosts

127.0.0.1 localhost

establish the mapping between the IP and the domain name , access to the domain name directly, if you want to access the remote machine, you must configure the remote machine's domain name and IP address mapping in the current machine/etc/hosts file , So when we access the remote domain name, we will resolve the/etc/hosts to locate the remote machine's IP address, thus accessing the remote machine.

4.vim cat gedit Viewing files

The file needs a page view, you can use the more command, press ENTER to page

Tail viewing the final contents of a file

5. Create a file Touch spark.txt

6.mkdir a Create a level directory, Mkdir-p a/b/c create a multilevel directory at once

7.rmdir Delete directory, RM-RF Force delete all contents in current file (clip)

8.TAR-CZVF xxx.gz a.txt Compressed file tar-zxvf xxx.gz

9.man < operation name > can be viewed using

10. File Permissions

The 1th column: "-" represents the file; "D" represents the directory; "L" Shortcut

2nd to 4th Column: Represents the current user's specific operation permissions for the file

1) Readable R 2^2=4

2) Writable W 2^1=2

3) executable x 2^0=1

5th to 7th column: Represents the user group of the current user for the file (folder) operation permissions

Column 8th to 10th: Action permissions on the file (folder) on behalf of users other than the current user group

11th column: Number of connections representing the current file

12th column: The user owner who represents the current file

13th column: Represents the user group where the current user resides

14th column: Representing file size

15th column: Represents the time the file was created or modified

11. User and user groups to modify files

Create User: Useradd Work1

Owner of the settings file: Chown work1 a.txt

Change the user group to which the current file belongs: Chgrp work A.txt

12. Modify File Permissions

chmod 764 a.txt Results:-rwxrw-r--

chmod 744 a.txt Results:-rwxr--r--

13.SHH Remote login without password

sudo apt-get install SSH download installation SSH service;

sudo apt-get install rsync installation automatic synchronization service;

Linux most commonly used command combat