system( ), printing output & matching

[zuinc]

Im still a beginner at perl and am writing a script that should ping a list of IP addresses and print the results to a separate file. I would then like to search through that file for only valid IP addreses and then have them printed into another file. I figure this is the hard way to do things but Im still learning. =) My next step will be to telnet into those machines for which I will use EXPECT. But for now, I am able to ping those machines but their status is not printed to that file and Im not sure if my search through that file is working correctly. Heres what I have so far:

# Create a list of all possible IP addresses within subnet
open(ALLIP, ">allip.list") || die "Unable to create file: allip.list\n
+";
for ($i=0; $i<=20; $i++) {
        print ALLIP "$ip_subnet.$i\n";
}
open(ALLIP, "allip.list") || die "Unable to open file: allip.list\n";
open(PINGALLIP, ">pingallip.list") || die "Unable to open file: pingal
+lip.list";
while (<ALLIP>) {
        system("ping $_ >pingallip.list") && "Unable to create file: p
+ingallip.l
ist";
chomp; }
open(OUTPUT, ">output.list");
open(PINGALLIP, "pingallip.list") || die "Unable to open file: pingall
+ip.list";
my $line = 0;
while (<PINGALLIP>) {
chomp;
#my $line = 0;
#while (<ALLIP>) {
#chomp;
        if ($_ eq~ m/is alive/) {
                $line++;
                last;
        }
}
      close(ALLIP);

        if ($line) {
                print OUTPUT "$_\n";
        } else {
                print "ERROR\n";
        }

This keeps returning 'ERROR' and doesnt print anything to 'pingallip.list'. Any ideas? Thanks.

~Zuinc