Managing user accounts is a fundamental task for any Linux system administrator. Proper user management ensures that only authorized individuals have access to the system, and it helps in maintaining system security and organization. This article will guide you through the essential commands and practices for creating, modifying, and deleting user accounts in a Linux environment.

Examples:

1. Creating a New User: To create a new user in Linux, you can use the useradd command. For example, to create a user named "john", you would execute:

   sudo useradd john

   After creating the user, you should set a password for the account:

   sudo passwd john

2. Modifying User Information: If you need to modify user information, such as the user's home directory or shell, you can use the usermod command. For instance, to change John's shell to /bin/bash, you would use:

   sudo usermod -s /bin/bash john

3. Deleting a User: To delete a user account, you can use the userdel command. If you also want to remove the user's home directory and mail spool, you can add the -r option:

   sudo userdel -r john

4. Listing Users: To list all user accounts on the system, you can view the contents of the /etc/passwd file:

   cat /etc/passwd

5. Adding a User to a Group: To add a user to a specific group, you can use the usermod command with the -aG option. For example, to add John to the "sudo" group:

   sudo usermod -aG sudo john