This is a funny one, let me first explain what we end up with, before cutting it in pieces: we will get a list of all the files we have no permission for, in the /var directory ( the error messages we usually see on the screen as we try to access a file we have no permissions for ).
List all the files in all directories ( ls -R ) in the /var directory ( /var ) and send them ( > ) to the black hole ( /dev/null ) and send all the error messages ( 2> ) to a file called errors.txt ( errors.txt )

Bruno
-- May 13 2003 ( Revised Dec 10 2005 ) --