Embedded environment: Add users under CentOS and give users root access

Source: Internet
Author: User
Tags root access

Add users under CentOS and give the user root access http://www.centoscn.com/CentOS/config/2014/0810/3471.html

1, add the user, first with the AddUser command to add a normal user, the command is as follows:

#adduser Tommy

Add a user named Tommy
#passwd Tommy//Change Password
Changing password for user Tommy.
New UNIX Password://Enter your password here
Retype new UNIX Password://Enter password again
Passwd:all authentication tokens updated successfully.

2. Give root permission

Method One: Modify the/etc/sudoers file, locate the following line, remove the previous comment (#)

# # allows people in group wheel to run all commands
%wheel all= (All) all

Then modify the user to belong to the root group (wheel) with the following command:

#usermod-G root Tommy

You can now log in with your Tommy account and then use the command Su-, you can get root privileges to operate.

Method Two: Modify the/etc/sudoers file, locate the following line, and add a line under root as follows:

# allow Root to run any commands anywhere
root all= (all) all
Tommy All= (All) all

After the modification, you can now log in with your Tommy account, and then use the command Su-to get root privileges to operate.

Method Three:To modify the/etc/passwd file, locate the following line and change the user ID to 0 as follows:

Tommy:x:500:500:tommy:/home/tommy:/bin/bash

Modified as follows

Tommy:x:0:500:tommy:/home/tommy:/bin/bash

Save, with Tommy account login, directly get the root account permissions. Friendly reminder: Although method three looks simple and convenient, but generally not recommended use, recommended method two.

Embedded environment: Add users under CentOS and give users root access

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