If anyone can point me towards some resources or provide me with an answer to the following I would greatly appreciate. I have this code. The purpose is to take Input either in a text file or an Ip address range. A synopsis of the code in question: 
use strict;
use Getopt::Long;

my $Input_File=0;
my $Ip_Range=0;

GetOptions('InputFile|i=s' => \$Input_File
            'Ip|I=s' => \$Ip_Range);



if ($Input_File xor $Ip_Range)
{
# We have one or other of the input options given in the command line.
}
else
{
no valid input print usage.
}

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My question is : Am I missing a way for Getopt::Long to take care of the conditional I wrote. Some way or requiring an option to be passed or even better if no option is passed for the script to use ARGV[0] as the input file. For example 
script.pl i input.txt
script.pl I 10.1.1.1-10.1.1.254
script.pl input.txt

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should all be valid. With the code above I can resolve the first two. I have been searching for examples and am missing something very obvious I know. I know I can add an elseif to catch the third case but it seems Getopt::Long should handle this and I am misreading it. Thank you Note Updated bad logic in the conditional and missing ; and reminds one self cut and paste don't retype.

In reply to Getopt::Long Validation by Ninthwave

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