TSA6213 GROUP 1 Debian OS

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====== How to create and delete users ======

 We use **//sudo adduser username//** to create a new user\\
 Sudo command must be used by sudoer user only.\\

 If you want to assign the user to a group for example sudo group you can use **//sudo adduser username sudo//**


  * How to create a user:

 1. Fisrt User: myself

  - Ordered List ItemFirst make sure your are using a sudoer group user or root to perform sudo command.
  - Then use **//sudo adduser aidel//** 
  - Then you will need to insert your password which i insert **//aidel//** as the password
  - Then you will have to insert the details of the user such as full name, group and phone number
  - system will ask whether the information is correct or not, if yes press y

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**//EXTRA//**\\
 Add user //aidel// to sudo group\\
  * use **//sudo adduser username sudo//**



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2. Second User: John Doe

- Ordered List ItemFirst make sure your are using a sudoer group user or root to perform sudo command.
  - Then use **//sudo adduser jdoe//** 
  - Then you will need to insert your password which i insert **//sysadmin#1//** as the password
  - Then you will have to insert the details of the user such as full name, group and phone number
  - system will ask whether the information is correct or not, if yes press y

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3. Second User: Will Smith

- Ordered List ItemFirst make sure your are using a sudoer group user or root to perform sudo command.
  - Then use **//sudo adduser wsmith//** 
  - Then you will need to insert your password which i insert **//sysadmin#2//** as the password
  - Then you will have to insert the details of the user such as full name, group and phone number
  - system will ask whether the information is correct or not, if yes press y

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4.Check the user

  - Use **//cat /etc/passwd//** 
  - it will appear the name of the user and the details

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  * How to delete user

  - Use **//sudo userdel username//** to delete user.
  - In this case i use **//sudo userdel aidel//** to delete user //**aidel**//
  - Use **//cat /etc/passwd//** to check again the list of user
  - Previously it will display user aidel details now after delete user aidel no longer exist

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  * Delete User and Home Directory
**-r**: Recursively removes the user’s home directory and mail spool.
 

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  *  Force Deletion
**-f**: Forces the removal of the user account, kills processes, and deletes files.

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  * Lock User Before Deleting
Locks the user's account before deletion to ensure no one logs in during the process.


**//EXTRA//**

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====== User Management ======

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**

  - login to any sudoer group user or root
  - Use **//sudo passwd username//** to change user password
  - Enter new password then you will be ask to retype you new password
  - Password change
  - 

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  * **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.

  - //**sudo chage [option] username**//

  * **sudo chage -l username**
Display the current password aging information


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  * **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**


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  * **sudo chage -W 7 username**
The user will receive a warning 7 days before the password expires.

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