I don't know a bunch of commands of the top of my head....
One command I do know is adduser. Type in
for more info. If you hit enter with the man page displayed, you can find more info and likely more commands. Also, there is a series called Linux Toolbox. This book is where I originally got the
from is SUSE Linux Toolbox. (I don't have it for reference on me) I reccomend you get Fedora\Red Hat Toolbox. These books are loaded with commands and details organized by function. It is a must-have for me.