SUDO and SU Commands: Mastering User and Group Management in Linux :B6:

In this blog, we'll cover user management: creating, deleting, changing users, and more.

Which User Are You?

To find out which user you're currently logged in as, use the command:

whoami

How to Add a User

To add a new user, use:

sudo adduser thor

Complete the details like the password for the user. Alternatively, to create a user without filling out details:

sudo useradd thor

Listing All Users

To see all users on the machine, use:

cat /etc/passwd

Passwords are stored in /etc/shadow in a hashed format.

Setting a User's Password

To set a password for a user:

sudo passwd ironman

Changing a User's Shell

To change the shell for a user:

sudo usermod ironman --shell /bin/bash

SU: Switch User

To switch to the root user:

sudo su -

To switch to another user (you'll need the user's password):

su - ironman

To log out from the current user session:

logout

Sudoers File

This file defines who can have superuser privileges. It's recommended to use visudo to edit it:

sudo visudo

To save the file, use Ctrl + X, then Y.

Deleting a User

To delete a user:

sudo userdel thor

Groups

Creating a Group

To create a new group:

sudo groupadd infinity

Checking Groups

To check if a group has been created:

cat /etc/group

To find out which groups you belong to:

groups

Adding a User to a Group

To add a user to a group:

sudo usermod -aG infinity ironman

• -aG: append to group

• infinity: group name

• ironman: user

To grant superuser permissions to a group, edit the sudoers file:

sudo visudo

Find the %sudo line, copy it, and replace sudo with your group name.

Removing a User from a Group

To remove a user from a group:

sudo gpasswd -d thanos infinity

To delete a user:

sudo userdel thanos

Deleting a Group

To delete a group:

sudo groupdel infinity

Conclusion

By following the steps outlined in this blog, you can efficiently manage users and groups on your system using superuser privileges. Whether you're adding new users, setting passwords, switching users, or managing groups, these commands and tips will help you maintain a secure and organized environment. Understanding and utilizing the sudo and su commands, along with proper configuration of the sudoers file, ensures that you have the necessary control and flexibility to manage your system effectively.

Note:-B6 is blog post 6 of this series

B1 link :- https://khushalmalik.hashnode.dev/the-rise-of-linux

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SUDO is like Superman for linux , Which allows user to run any kind of command

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