User management in Linux is a critical aspect of system administration. It involves creating, modifying, and managing user accounts and groups to ensure proper access control, system security, and resource allocation. Each user is assigned a unique identity, along with permissions and restrictions.

• Change user password

1. login to any sudoer group user or root
2. Use sudo passwd username to change user password
3. Enter new password then you will be ask to retype you new password
4. Password change

• Manage Password aging and expiration

The sudo chage command is used in Linux to manage password aging and expiration policies for a user. It allows administrators to define and control how long a user's password remains valid, enforce password expiration, and specify warnings before password expiration.

1. sudo chage [option] username

• sudo chage -l username

Display the current password aging information

• sudo chage -E 2025-12-31 username

Set the account expiration date. The account will be disabled after this date. To set account expiration to never use sudo change -E -1 username

• sudo chage -W 7 username

The user will receive a warning 7 days before the password expires.