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whoami

# Add user to sudoers
sudo adduser <username> sudo

# Switch user
su - user2

# List all local users
cut -d: -f1 /etc/passwd

# Add a new user
sudo adduser new_username

# Remove/delete a user, first you can use:
sudo userdel username

# Then you may want to delete the home directory for the deleted user account :
sudo rm -r /home/username

# Check which users are logged in:
who

# Log-out the user by sending the KILL signal to the user-process with:
sudo pkill -KILL -u <username>

# Get the current group I'm logged in as
id -gn