User

In Linux, a user is an account that is used to access the system resources and perform various tasks on the system. Every user in Linux has a unique username and a user ID (UID), which are used to identify and differentiate between different users.

When a user logs into the system, the system creates a session for that user, and the user gains access to their own set of files, directories, and system resources. Each user has their own home directory where they can store their personal files and data. The home directory is typically located under the /home directory and is named after the user's username.

Users in Linux are organized into groups, which are collections of users that have certain permissions and access to specific files and directories. A user can belong to multiple groups, and each group can have different permissions and access rights.

By default, Linux systems have at least one user account, which is the root account. The root user has unrestricted access to all system resources and can perform any task on the system. It is generally recommended to create additional user accounts for regular use and to only use the root account for system maintenance tasks that require elevated privileges.

In summary, a user in Linux is an account that is used to access the system resources and perform various tasks on the system. Each user has a unique username and UID, and users are organized into groups that define their permissions and access rights.

How to Create and Add a user in Linux ?

To add a user in Linux, you can use the `useradd` command. Here's an example command:

sudo useradd username

In this command, replace `username` with the username you want to create.

By default, the `useradd` command will create a new user with a home directory under the `/home` directory, and a UID and group ID (GID) that are unique and not already in use. However, you can also specify additional options to customize the user's settings, such as their home directory path, login shell, and password.

Here's an example command that creates a new user with a custom home directory and login shell:

sudo useradd -d /path/to/home -s /bin/bash username

In this command, replace `/path/to/home` with the path to the custom home directory you want to create, and `/bin/bash` with the login shell you want to use.

After creating the user, you can set the user's password using the `passwd` command:

sudo passwd username

In this command, replace `username` with the username you just created. You'll be prompted to enter and confirm a new password for the user.

After adding the user and setting their password, you can log in to the system using the new user account.