Ubuntu user Add Add sudo permission Group Add clutter overview

Groupadd-g 1005 Dev

Add user group specify GID to 1005

Delete user Group Dev

Add user

AddUser Mike

will automatically prompt you to enter a password, etc.

</pre><pre name= "code" class= "plain" >useradd  simael-u 600-g 1005-s/bin/bash

-u Specifies UID (System reserved 0-499)-g Specifies the shell used by the user group-s
and then

Set a password for a user

Delete User

Userdel Mike

If you are prompted to log off the user by skill

Skill-kill-u Mike

Logoff Mike User

To view all users and user groups:

Cat/etc/passwdcat/etc/group

To add permissions to the user that can use the sudo command

To add write permissions to the sudo file, the command is:

chmod u+w/etc/sudoers

Edit Sudoers File

Vi/etc/sudoers

Find this line root all= (all) all, add the following to him xxx all= (all) all (here xxx is your user name)

PS: Here you can sudoers add any one of the following four lines

Youuser            all= (All)                all%youuser           all= (All)                allyouuser            all= (All)                Nopasswd:all%youuser           All= (All)                Nopasswd:all

First line: Allows the user to execute the sudo command youuser (requires a password).
Second line: Allow user group Youuser inside user to execute sudo command (need to enter password).
Line three: Allow the user to execute the sudo command youuser, and do not enter a password at the time of execution.
Line four: Allow user group Youuser inside user to execute sudo command, and do not enter password at execution time.

4. Revoke sudoers file Write permission, command:

chmod u-w/etc/sudoers

This makes it possible for ordinary users to use sudo.
--------------------------------------------------------------------------------
ID-U Displays the UID of the current user

ID-G displays the GID of the current user

Look at the contents of/etc/passwd, the 4th item in each line is GroupID, and the fifth item is USR ID Info, similar to the group name. With Vim,grep, you can quickly find the row where the specified user is located. Be familiar with awk and write a script.

grep mike/etc/passwd|awk-f: ' {print $} '

Ubuntu user Add Add sudo permission Group Add clutter Overview