Shutdown-h now shuts down
Reboot restart your computer now
Logout user logoff
PWD [show current working directory]
CD [Change Directory]
mkdir directory name [build directory]
rmdir [Delete Empty directory]
MV [option] source file or directory destination file or directory [move file or rename file]
RM-RF directory name [delete directory and all files under directory] r recursion; F Force
Cp-r dir1 dir2 [recursive copy command]
Grep-n "HANXL" file name [query HANXL keyword in file]
Find directory-name file name [query for this file under the specified directory]
Useradd HANXL [Add user Hanxl]
USERADD-G Group name User name [add user and specify which group to assign the user to]
passwd HANXL [Modify HANXL's password or set password]
Userdel HANXL [delete user Hanxl]
Userdel-r HANXL [Delete user Hanxl and Hanxl's home directory] * If you want to keep what HANXL left behind, please use the delete user above!!!
All group information and all user information in Linux are in the two files of/etc/group and/etc/passwd, which can be viewed with the cat or VI command.
The permissions are divided into three types: R is readable, 4 is written, W is writable, 2 is, X is executable, and 1 is represented.
You can use chmod to change the permissions of a file or directory, for example:
chmod 777 HANXL: Give HANXL permission rwxrwxrwx
chmod u=rwx,g=rx,o=rx Hanxl: Ibid., u= user Rights, g= group permissions, o= other group user rights
chmod u-x,g+w HANXL: To hanxl Remove user-executed permissions, increase group Write permissions
chmod a+r HANXL: Add Read permissions to all users
Chown user name file or directory: Change the owner of a file or directory
Chown-r User name directory: Change directory and all file and directory owners below
CHGRP Group name File name: Modify the group in which the file resides
USERMOD-G Group name User name: Change the group where the user is located
usermod-d Directory name User name: Change the initial directory of user login
In Linux and UNIX systems | is the pipe command, which means to give the result of the previous command | After the command is processed
init [0123456] 0: Shut down, 1: Single user, 2: Multi-user State no Network service, 3: Multi-user State has network services, 4: The system is not used to retain to the user; 5: graphical interface; 6: System restart
To modify the default RunLevel, you can modify the Id:5:initdefault of the file/etc/inittab: The numbers in this row
grep "HANXL" AA > My.bak writes the found content to the file My.bak, or if >> appends the content to the end of the file.
Fdisk-l View Linux system partition details
Df-h Viewing disk usage
Easily fix Linux common commands
