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open FILE, "<", "$hostfile" || die "Cannot open $hostfile $!";

open( FILE, "<", $hostfile ) || die "Cannot open $hostfile $!";

open FILE, "<", $hostfile or die "Cannot open $hostfile $!";

while (<FILE>) {
    chomp;
    my ($key, $value) = split (" ", $_);
    $hosts{$key} = $hosts{$value};
    }

while (<FILE>) {
    my ($key, $value) = split;
    $hosts{$key} = $value;
    }

while (<FILE>) {
    my ($key, @values) = split;
    push @{$hosts{$key}} = @values;
    }