[Zope] Newbie question: Can't run on port 80

[David C. Morrill]

I've been running Zope 2.0.0b5 for a while on port 8080 under my own user id
on my Linux box. However, I decided to try to run it on the standard port
80, but have not been having any luck. Here is what I did:
  - added '-w 80' option when starting Zope (i.e. ZServer)
  - 'chown nobody.nobody var'  (to make 'nobody' the owner of the 'var'
directory)
  - started Zope as su (superuser)

It almost works, but right at the end of the Z2.py file where it tries to
open the 'Z2.pid' file for writing, it gets a 'permission denied'. I'm not
really much of a Unix/Linux expert, so I'm not sure what else I need to do
to get the permissions set up correctly (BTW, there is no 'Z2.pid' file
already in 'var' when I attempt to start Zope. I rm'ed it manually since it
was owned by my normal user id from previous Zope sessions). Can any Linux
gurus spare me a clue? TIA

Dave Morrill