Create and modify user accounts

sudo adduser bob = root creates new user
sudo passwd = change a user’s password
sudo deluser = delete an account

addgroup friends = create a new user group
delgroup friends = delete a user group

usermod -g friends = add user to a group
usermod -g bob boby = change account name
usermod -aG friends bob = add groups to a user with- out loosing the ones he’s already in