If there is a reason why it would be different for one program and not the others,

It's always wrong, but it doesn't give you trouble since you never use it.

but I want it to print 20 times and then the program to say "Wait...".

You need some kind of loop to do something repeatedly.

#!/usr/bin/perl

use strict;
use warnings;

print "Hello World!\n" for 1..20;
print "Wait, that's it?\n";
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