How do I create accounts, groups and so on only using the command line?
 

How do I create accounts, groups and so on only using the command line?

Create an account: useradd (or adduser)
Create a group: groupadd

Short examples:
useradd -c "comment" -d "homedir" -m <loginname>
groupadd <groupname>

There are more option, please read both manpages before experimenting.

Other commands that you might need/want:
userdel -> delete user
groupdel -> delete group
usermod -> modify user
groupmod -> modify group

Hope this gets you going.

Thanks, exactly what I needed to know. :)