USAGE: groups [-a | -d] [groupname] [name 1] [name 2] …
The group command allows you to add personal groups that may be used to alias a group of people, generally for sending mail.
No flag: Shows the mud’s standard groups and your private groups.
-a : Adds a group to your groups info, along with a list of at least 1 name, all separated by spaces. -d : Deletes a group, or if you give a list of names, deletes that list from the specified personal group.