So, you’ve got 20+ clients who’ve flown in from interstate for training and you’ve discovered that all the machines they’re using have the annoying access control lists turned on (ie you do an “ls -l” in the terminal and you see the “+” sign in a left hand column. You can do “ls -e” for more file acl info.), which is probably stopping things working as expected.
The magic command to turn acl’s off on Mac OS X is
sudo fsaclctl -a -d /
If you’re trying to remember the command, presumably fsaclctl stands for “File System Access Control List ConTroL”