I am familiar with adding Groups with the GUI in MAC OS X, but I am trying to do it via SSH to a computer I remotely manage as a production server. I want to create / modify some of my users for a particular directory by creating a new group. In Another helpful serverfault post, I see that I need to add the users to the group name at /Groups/foo, however my system's Groups folder does not exist...

Does Mac OS X create the Groups directory only when you actually create the group – if there do not already exist any groups on the Machine? Is this something that I can do simply using:

mkdir "Groups"

Or maybe I'm wrong altogether. Any pointers for how to go about this with Unix? – I should note also that this group will be used to manage the access to a directory on my server via an .htaccess file. Thanks!