Super User

* Sudo allows a system administrator to delegate authority to give certain users or groups of users the ability to run some or all commands as root .

* super user with unrestricted access to all system resources and files in Linux is the user named root.

* sudo has a user ID, of 0 which is universally identified by Linux applications .

* You will need to log in as user root to add new users to your Linux server.

Creating Super user

> Add the user vinod

> suppose i {root} wanna give authority to vinod to run fdisk command, i will need to find the path of fdisk by following command

# whereis fdisk

> Open the sudo configuration file

# visudo

>Now go down at the root prompt, and put this entry

vinod ALL(ALL) /sbin/fdisk <-- its the path of fdisk command

Note: If you wanna vinod to have all authorities of root user, then put ALL at the place of /sbin/fdisk

> save and exit the file

> Login by user vinod

$ sudo /sbin/fdisk -l

> Give password of your own

> Now if you wanna run any command, then you have find its path first and then run the command with the path

>Suppose i need to run partprobe command , then i will do something like this:-

# whereis partprobe

# sudo /sbin/partprobe /dev/sda5