Groups have been set up on the AITS cluster to permit project teams to share code without making it writeable (or readable) to the rest of the world. Each group contains the members of a team. Use chmod and chgrp to set the access to your project files. The groups command will tell you which group you are in. If you were logged in while the changes were made, you will probably need to logout / login to see the groups.
Here are the groups and their membership:
group members
gaus01 aus27,aus11
gaus02 aus13,aus12
gaus03 aus33,aus16
gaus04 aus23,aus36
gaus05 aus38,aus10
gaus06 aus29,aus15
gaus07 aus31,jh36
gaus08 aus25,aus19
gaus09 aus20,aus21
gaus10 aus41,aus18
gaus11 aus30,aus17
gaus12 aus22,aus14