The rm command deletes a file. Be careful with this one. The mkdir command creates a directory. The passwd command changes your password. The newgrp command changes your current group.
Most users are members of one group.
However it is not uncommon for CLC workers to be members of several groups. As shown above, you find out who you are by typing id . You then need to find out what groups you are in by typing groups . To change to one of these groups type newgrp . The names of the groups describe the area of the web tree you are working on.