User management using a terminal

1. Creating a New User Account (useradd):

   sudo useradd -m username

   • Example:

     sudo useradd -m john

2. Setting a Password for the User (passwd):

   sudo passwd username

   • Example:

     sudo passwd john

   • Output:

     Enter new UNIX password:
     Retype new UNIX password:

3. Adding User to a Group (usermod):

   sudo usermod -aG groupname username

   • Example:

     sudo usermod -aG sudo john

4. Deleting a User Account (userdel):

   sudo userdel -r username

   • Example:

     sudo userdel -r john

5. Listing User Accounts (cat /etc/passwd or getent passwd):

   cat /etc/passwd

   • Example:

     cat /etc/passwd

6. Changing User Information (usermod):

   sudo usermod -c "New User Info" username

   • Example:

     sudo usermod -c "John Doe" john

7. Locking and Unlocking User Accounts (passwd):

   To lock a user account:

   sudo passwd -l username

   • Example:

     sudo passwd -l john

   To unlock a user account:

   sudo passwd -u username

   • Example:

     sudo passwd -u john

8. Listing User Groups (cat /etc/group or getent group):

   cat /etc/group

   • Example:

     cat /etc/group