Put your action in a loop and include this statement: sleep(300) as part of the loop.
So your overall code might look like:
while(condition){
##  code here
if(exit condition){
  ## code here
}else{
  sleep(300);
}
}

[download]
At least this is what I am assuming from your question.

TStanley
--------
There's an infinite number of monkeys outside who want to talk to us
about this script for Hamlet they've worked out
-- Douglas Adams/Hitchhiker's Guide to the Galaxy

In reply to Re: A script that does an action every 5 minutes by TStanley
in thread A script that does an action every 5 minutes by Jemts

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