#!/usr/bin/perl

use strict;
use warnings;

my %status;
my $file = './status.dat';
{
    local $/ = "hoststatus{\n";
    if ( open my $fh, '<', $file ) {
        while ( my $block = <$fh> ) {
            my ($hostname,$status) = $block =~ m!
                host_name:([^\n]+)
                .*?
                scheduled_downtime_depth=(\d+)
            !xms;
            next if !( $hostname && $status );
            $status{$hostname} = $status;
        }
    }
    else {
        print "Fehler beim Einlesen von $file: $!\n";
    }
}

for my $host ( keys %status ) {
    print $host,"\n" if $status{$host} == 1;
}