privacy in Unix environment

Hello everyone, here is a question well suited for the c'punks. I'm looking for some kind of utility that will allow script files to be run, to spawn off processes, but will wipe out environment and "ps" info from being read. i.e. imagine that the commands being called must shield their arguments and environment from the "ps" command run on a system. the ideal program would let me run csh scripts but make all the unix commands called (sort, grep, whatever) invisible to other users on my local system. can it be done? note: I am aware of the trick of using symbolic links to hide command names. tx. bye