I'm not familiar with Aix, but googling for "Aix proc filesystem" shows it exists. Can't you just loop thru all the pid entries? Each pid has it's own directory named the numeric pid. For example: /proc/$pid/cmdline will give you the command line name of the $pid. All sorts of useful information is in there. It probably isn't real efficient to loop through all the pid directories, but neither is Proc::ProcessTable. :-)