[Zope] How exactly do I restart zope?

[NYNewMedia]

  How exactly do I restart zope?
  I have an eight month old zope box running on Linux 5.1 We had to
manually restart the server. The question for us now is how exactly to
restart zope? 
  We tried to restart http, and tried some of the intructions on zope.org,
but have not been able to get it to run, mainly because we are not zope
experienced. Result: we are not able to run the web site or the content
admin tool.
  Can anyone give exact instructions?
Thanks,

Wil

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