Linux users get administrator privileges

This article describes how to obtain administrator permissions for common linux users. the Test environment is CentOS5.5.

1. add a user. First, use the adduser command to add a common user. the command is as follows:

Copy codeThe code is as follows:
# Adduser tommy

// Add a user named tommy
# Passwd tommy // change the password
Changing password for user tommy.
New UNIX password: // enter the New password here
Retype new UNIX password: // enter the new password again
Passwd: all authentication tokens updated successfully.

2. Grant root permissions

Method 1: modify the/etc/sudoers file, find the following line, and remove the comment (#).

Copy codeThe code is as follows:
# Allows people in group wheel to run all commands
% Wheel ALL = (ALL) ALL

Then modify the user and make it belong to the root group (wheel). The command is as follows:

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# Usermod-g root tommy

After modification, you can log on to the system using the tommy account and run the su-command to obtain the root permission.

Method 2: modify the/etc/sudoers file, find the following line, and add a line under root, as shown below:

Copy codeThe code is as follows:
# Allow root to run any commands anywhere
Root ALL = (ALL) ALL
Tommy ALL = (ALL) ALL

After modification, you can log on to the system using the tommy account and run the su-command to obtain the root permission.

Method 3: modify the/etc/passwd file, find the following line, and change the user ID to 0, as shown below:

Copy codeThe code is as follows:
Tommy: x: 500: 500: tommy:/home/tommy:/bin/bash

After modification

Copy codeThe code is as follows:
Tommy: x: 0: 500: tommy:/home/tommy:/bin/bash

Save. after you log on with the tommy account, you can directly obtain the permissions of the root account.