4 Examples To Grant Normal User Root Privileges In Linux

The “root” super user is the king of users in Linux/Unix. Having root access grants full and unlimited access to the Linux box. I will show you how to allow root access to a user in a Linux system. Typically, root level access is used in system administration. So it is always a pain to give root access to other users. You need to be careful and should withdraw the access once the need to do so is over.

According to Linux file system permissions, root or super user has full permission to read(r), write (w) and execute(x)  any file. By default root user id is '0'.

I am going to create two users namely user1 and user2. Then I will show you how to give root access to user1 .

Method : 1 Using Usermod Command

[[email protected] Desktop]# adduser user1
[[email protected] Desktop]# adduser user2
[[email protected] Desktop]# groupadd test

These are the groups I have in my Linux box.

[[email protected] /]# groups
root bin daemon sys adm disk wheel

I am going to add user1 to root group as follows:

[[email protected] Desktop]# usermod -G root user1

The command given below provides existing user with the root privilege:

[[email protected] Desktop]# usermod -g 0 -o root_user

Method 2 : Using Useradd Command

I have added a new user, 'user3' to the root group using one single command:

[[email protected] /]# useradd -m -G root user3
[[email protected] /]# groups user3
user3 : user3 root

Another option using useradd command:

Useradd -c “Imitation Root” -d /home/root_user -m -k /etc/skel -s /bin/bash -u 0 -o -g root root_user

Method 3 : Editing /etc/passwd file

Edit /etc/passwd for the particular user. Change the user's UID and GID to '0'. This will give root permissions to user.

root:x:0:0:root:/root:/bin/bash
temproot:x:128:128:temproot

Now, temproot user should have root privilege:

root:x:0:0:root:/root:/bin/bash
temproot:x:0:0:temproot

Note : This is not recommended method for granting root access

Method 4 : Setting as Sudo User

The sudo configuration file is /etc/sudoers and you can edit this file using visudo command: # visudo.

Using visudo protects from conflicts and guarantees that the right syntax is used.

To give full access to specific users:

Add the entry given below in the file:

bob, tom ALL=(ALL) ALL

Following this method is not a good idea because this allows both bob and tom to use the su command to grant themselves permanent root privileges. Thereby skipping the command logging features of sudo.

Granting access to specific files to one particular user:

This entry allows bob and all the other members of the group operator to gain access to all the program files in the /sbin and /usr/sbin directories, as well as the privilege of running the command /usr/oracle/backup.pl.

bob, %operator ALL= /sbin/, /usr/sbin, /usr/oracle/backup.pl