User and Group Management

adduser (add a new user)

• creates a new user and prompts for user details

sudo adduser new_user

usermod (modify a user account)

• adds a user to the group

sudo usermod -aG group_name user_name

passwd (change user password)

• changes the password for a user

passwd user_name

deluser (delete a user)

• removes a user from the system

sudo deluser user_name

groupadd (add a new group)

• creates a new group

sudo groupadd new_group