Converts a Token-Ring MAC-Address into an Ethernet MAC-Address and vise versa. Demonstrates the usage of hashes.
Author: G. Lange, glange@libero.it
#!usr/bin/perl -w 
# Converts a Token-Ring MAC-Address into 
# an Ethernet and vise versa.
# Hashes 
# MAC-Address Format: 00-30-F5-07-5D-7D 

$0 =~ s|^.*[\\/]||;
$usage="Usage: $0 <mac-address>\nFormat of the mac-address: xx-xx-xx-x
+x-xx-xx\n"; 
if ($ARGV[0] eq "") { print $usage; exit; } 

%convert = (
    "0" => "0",
    "1" => "8",
    "2" => "4",
    "3" => "C",   
    "4" => "2",
    "5" => "A",
    "6" => "6",
    "7" => "E",
    "8" => "1",
    "9" => "9",
    "A" => "5",
    "B" => "D",
    "C" => "3",
    "D" => "B",
    "E" => "7",
    "F" => "F",
    );  


$mac = $ARGV[0];
@mac_array = split( /\-/ , $mac);  

foreach $a (0 .. $#mac_array) { 
    $c_mac[$a] = $convert{substr(uc($mac_array[$a]),1,1)}
               . $convert{substr(uc($mac_array[$a]),0,1)};
    # if ($a < ($#mac_array)) { $c_mac[$a].= "-"; }
} 
$mac = join("-", @c_mac); 
print $mac;

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