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User

Add a User

To create a user that is a member of the wheel, users, and audio groups. As root:

useradd -m -G users,wheel,audio -s /bin/bash UserName

This will also create a shell and home directory for the UserName. After that, assign a password to the user account. As root:

passwd UserName

So to add the user wolfden I would run

useradd -m -G users,wheel,audio -s /bin/bash wolfden
passwd wolfden

Type the password, as you type, it will not show any characters, retype password when it asks.

To see what groups you belong to:

groups

or

groups UserName

Delete a User

To remove a user along with home directory and mail spool, as root:

userdel -r UserName

Add an existing user to a group

As root, run the command:

gpasswd -a UserName wheel

You can add a user to multiple groups at same time by running

usermod -aG wheel,audio UserName

Warning on the usermod, do not forget the -a or you will remove yourself from all existing groups and only belong to wheel and audio

Remove user from group

As root, run the command:

gpasswd -d UserName audio

Add a user to sudo

As root, run the command

visudo

Than you need to uncomment a line 

## Uncomment to allow members of group wheel to execute any command
# %wheel ALL=(ALL) ALL

Change it so it looks like 

## Uncomment to allow members of group wheel to execute any command
%wheel ALL=(ALL) ALL

Save the file.