batch ping problem

[derek3000]

Hi. I'm writing a little batch pinging utility that asks for the third octet and then scans the fourth from 1-255. I want the ping results to go to a log file, and then to scan that log file for a line containing "x bytes from 10.32.z.y" so that i know that ip is taken. The code is below. First though, I want to make sure my problems are clear: 1. It prints nothing to "ips.txt", even though ping fills out "log.txt" fine. 2. Styllistically, I want any suggestions to make the code more idiomatic.

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#!/usr/bin/perl -w

use strict;

print "Please enter the third octet for scannin': ";
my $octet3 = <>;
chomp $octet3;

open(LOG, ">log.txt") || die "Couldn't open log file: $! \n";

for(my $x = 0; $x < 20; $x++){
    open(PINGIN, "ping 10.32.$octet3.$x -w 5 |") or 
        die "Couldn't pull that one off: $! \n";
    while(<PINGIN>){
        warn "Logging activity for 10.32.$octet3.$x \n";
        print LOG $_;
    }
}

close PINGIN;
close LOG;
open(LOG, "log.txt") or die "$!";
open(UNAVAILABLE, ">ips.txt") or die "$!";

while(my $line = <LOG>){
    if($line =~ /^64 bytes from ([0-9.]):/){
        my $ip = $1;
        print UNAVAILABLE "$ip is unavailable.\n";
    }
}

close LOG;
close AVAILABLE;

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any help would be much appreciated. Thanks, Derek