Non registering shell

[Rory Savage <rsavage () nandomedia com>]

I have a question I hope somebody will be able to answer.  I am looking
for code to build a UNIX shell which is immune to system process listing
and or logged by the syslog facility, is this possible?  I used to work
for a government contractor , and met a UNIX systems programmer who
wrote a shell which made his work invisible.  Can anyone share info on
this?

thanks

-Rory Savage