why not?

unless I am overlooking something obvious, my sample code would run "stuff" at every hour, on the hour.

Well, except the first time, that would run inmediately, but that can be changed easily: 

my $first = time;

while (1) {

  # Do stuff here;

  my $next = int((time - $first + 3599)/3600) * 3600;
  sleep ($first + $next - time);
}

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In reply to Re^4: Pause Loop by salva
in thread Pause Loop by pyro.699

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