Respected Monks,

I have written a small script that 1) Takes the input and converts it to lower case and then 2) inserts ":" between every two characters.

I wrote this script so that I dont have to keep adding the ":" manually. These are HBA WWNs that we use to manage our SAN.

Here is the script:

#!/usr/bin/perl

use warnings;
use strict;
until (our $wwn eq "q")
{
print "Enter the wwn: ";
chomp ($wwn=<STDIN>);
my @wwn = unpack ("(a2)*", lc($wwn));
@wwn = join (":", @wwn);
print "@wwn\n";  
}
[download]

Everytime I execute it, I get the error :  Use of uninitialized value $wwn in string eq at wwn.pl line 5. The scripts runs fine, just keeps giving this message. Here is a sample output:

C:\Users\Documents\perl\practice>perl wwn.pl
Use of uninitialized value $wwn in string eq at wwn.pl line 5.
Enter the wwn: 10000000ABCDEFGH
10:00:00:00:ab:cd:ef:gh
Enter the wwn: 10000000C9A2B3CD
10:00:00:00:c9:a2:b3:cd
Enter the wwn: q
q

C:\Users\Documents\perl\practice>
[download]

I tried using  while ($wwn ne "q") but still I get the same error message. Which I now see makes sense because both these say the same thing.

Please let me know where I am going wrong. Also, I just browsed the net and found the unpack function and have tried using it. The Perldoc has a very small article on in that doesn't tell me much. Any other pointers that explains unpack will really help me. I don't like using stuff that I don't understand clearly in a script, but its been many days, and I am not advancing much so getting impatient and used unpack without much understanding it. Kindly help me.

Update: I tried changing $wwn to "our" thinking that stating it to be "my" may be creating issues, but that also doesn't seem to be the case.

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