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  1. or download this
    use strict; 

my $string = 'hello world'; 
print substr($string,'O',5)."\n";
  2. or download this
    perl absurd.pl
hello
  3. or download this
    use strict; 
use warnings;

my $string = 'hello world'; 
print substr($string,'O',5)."\n";
  4. or download this
    perl absurd.pl
Argument "O" isn't numeric in substr at absurd.pl line 4.
hello