file script and cmd script difference

Hi list,

I'd like to ask explaination/help regarding this:

1)perl -e '%hash; for (`arp`) {($addr,$mac) = (split(/\s+/))[0,2];
$hash{$addr}= $mac } foreach (keys %hash) { print "\t $_ => $hash{$_}\n";}'
it emits the output which i'm hoping to see ex: wrkstation => MACADDR;
but this:
2)
#!/usr/bin/perl

use strict;
use warnings;

my %macs;

for (`arp`) {
my($addr,$mac) = (split(/s+/))[0,2];
$macs{$addr} = $mac;
}

foreach my $key (keys %macs) {
print "\t $key => $macs{$key}\n";
}

It's a doesn't produce the same thing, why?

Again thanks in advance.

/joseph


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