Recently a colleague of mine showed me how to find out what environment variables a process is using at the time its running. This works on Linux but not on OS X.
Find out the PID for the process you want to inspect
[@riyadh:~] $ ps -ef | grep mysql mysql 1142 1 0 Jul06 ? 00:00:24 /usr/sbin/mysqld
Then its a simple step of catting the environ section of proc for that PID which in this case is 1142
[@riyadh:~] $ sudo cat /proc/1142/environ PATH=/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/sbin:/sbin:/bin TERM=linuxHOME=/etc/mysqlRUNLEVEL=2PREVLEVEL=NUPSTART_EVENTS=runlevel UPSTART_JOB=mysqlUPSTART_INSTANCE=
On OS X, you can get information by using:
[@riyadh:~] $ ps -Eww $PID
Be warned, this gives you a lot more than just what environment variables that process is using.