First, I presume that if this is possible it would need to be done as root (or as a user who shares root's UID of 0).
How can a process be launched so that it does not show up in a
ps aux or
ps ef or
top listing if the command is run by non-root?
Is this even possible?
The distributions I typically run are RHEL/CentOS and Ubuntu - so if there is a distro-specific answer, that's ok, too.