Greetings!

I am trying to run a for loop that forks and runs a subroutine and then capture the output from the sub into a hash so that i can sort the output of the sub, but i can't figure out the piping.

Originally i was writing everything to a file, then using the packed default sort, however, i was hoping to be able to do all of this in memory.

Here is the code (without the piping) - any other coding tips are welcome as well since i am a bit green: 
#!/usr/bin/perl
use strict;
use warnings;

my @childs;
my $net = shift();

my $netdns = "";
my $addns = "";

for ( my $count = 1; $count <= 254; $count++) {

my $ip;
    $ip = $net . "." . $count;
        my $pid = fork();
        if ($pid) {
        # parent
            push(@childs, $pid);
        } elsif ($pid == 0) {
                # child
                &check($ip);
                exit 0;
        } else {
                die "couldnt fork: $!\n";
        }
}
 
foreach (@childs) {
        my $tmp = waitpid($_, 0);
}

sub check {
        my $address = shift;
    my ($undef, $ad, $networks, $ping, $ssh, $rdp);

    open(ADDNS, "nslookup $address $addns|") || return 1;
    local $/ = "\n\n\n";
        while (<ADDNS>) {
            ($undef,$undef,$undef,$undef,$undef,$undef,$undef,$ad) = s
+plit(/[\t \n]+/);

                    if (defined $ad && length $ad > 0) {
                if ( $ad !~ m/edu/ ) {
                    $ad = "none";
                }
            } else {
                $ad = "none";
            }
        }
    close ADDNS;

    open(NETDNS, "nslookup $address $netdns|") || return 1;
    local $/ = "\n\n\n";
        while (<NETDNS>) {
            ($undef,$undef,$undef,$undef,$undef,$undef,$undef,$network
+s) = split(/[\t \n]+/);

                    if (defined $networks && length $networks > 0) {
                if ( $networks !~ m/edu/ ) {
                    $networks = "none";
                }

                if ( $networks =~ m/[\d]{5,}/ ) {
                    $networks = "none";
                }
            } else {
                $networks = "none";
            }
        }
    close NETDNS;

    open(PING, "ping -c 1 -w 1 $address|grep received|") || return 1;
        while (<PING>) {
            ($undef,$undef,$undef,$undef,$undef,$ping) = split(/[\t \n
+]+/);

            if ( $ping =~ m/100%/ ) {
                $ping = "N";
            }

            if ( $ping =~ m/0%/ ) {
                $ping = "Y";
            }
        }
    close PING;

    if ( $ping =~ "Y" ) {
        open(NMAP, "sudo nmap -sS -p 22,3389 $address |grep tcp|") || 
+return 1;
        local $/ = "\n\n\n";
            while (<NMAP>) {
                ($undef,$ssh,$undef,$undef,$rdp,$undef) = split(/[\t \
+n]+/);

                if ( $ssh =~ m/open/ ) {
                    $ssh = "Y";
                } else {
                    $ssh = "";
                }

                if ( $rdp =~ m/open/ ) {
                    $rdp = "Y";
                } else {
                    $rdp = "";
                }
            }
        close NMAP;
    } else {
        $ssh = "";
        $rdp = "";
    }

printf "%-18s %-4s %-4s %-4s %-35s %-35s\n", $address, $ping, $rdp, $s
+sh, $ad, $networks;
exit;
}

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In reply to Piping and Parallel Forks by adambot

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