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use strict; #always and forever, amen.
use warnings;  #or else.

...
#@ARGV is an array containing the arguments supplied. We're taking the
+ first value.
print "\n$argument"; 
#This here will show you exactly what has been put into $argument.

$bar='Hello,';
...
#will first print out the contents of $bar, then $baz because 
#those are the arguments given.
}

foo("square", 3);

sub foo{
  my ($shape, $size) = @_;
}