@lines = split(/\n/,$space{ $host });

shift @lines;
my @recs;
foreach $disk_used (@lines)
{
     $_ = $disk_used;
     if (/(\/\w+\/\w+)\s+\w+\s+\d+\s+\d+\s+(\d+)\s+(\d+)%/ )
     {
           $free = 100-$3;
           push @recs,[$host,$1,$2,$free,"$host:$1     $2      $free%"];
     }
}
@out=map { $_->[-1] } sort { $b->[3] <=> $a->[3] } @recs;