use Term::ReadKey;
my $key = '';
ReadMode(4);
                                                                                
my %keys = ( A => 'KeyUp', B => 'KeyDown', C => 'KeyRight', D => 'KeyLeft');
while ($key ne 'q' )
{
   while (not defined ($key = ReadKey(-1))) {
# No key yet
   }
                                                                                
   if ( ord($key) == 27 )
   {
      if( ReadKey(-1) eq '[' )
      {
        $key = ReadKey(-1);
                                                                                
        print $keys{$key},"\n";
      }
   }
}
print "\n";
ReadMode(0);