Thanks for this. I just noticed I put "||" in my post instead of "//" which is what I have in my script. I know how they differ but thanks for pointing it out.

I have now figured out it was a combination of using the // operator and also chomp. The code now looks something like:

my $in1 = $ARGV[0];
chomp(my $in2 = $ARGV[1] // '');

if (defined $in1) {
   $in1 =~ s/\s+//g; # Remove all whitespace instead of chomp
   if ($in1 =~ /\D+/) {
      print "Input invalid. Only numbers are allowed\n";
   }
} else {
   print "No valid input given\n";
}

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In reply to Re^2: Using number "0" as an input argument by Doozer
in thread Using number "0" as an input argument by Doozer

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