You can also use what's called a naked block, to do what you want:

#!/usr/bin/perl -w

use strict ;
use LWP::Simple qw(getprint);

use constant NIST_SERVER => 'http://132.163.4.101:13';

print <<HERE;
This will get the time from an NIST clock 5 times
and then ask you if you want to continue.  Use 'y'
to continue and any other key to stop:

HERE

{
  getprint(NIST_SERVER) for 1..5;

  print 'Do you want to continue? [yn]: ';
  chomp(my $answer = <STDIN>);
  redo if lc($answer) eq 'y';
}

print "Good-bye!\n\n";
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