Given a particular terminal type ReadKey() may need to be called repeatedly to retrieve a multicharacter code for a given control key - so for instance on an xterm on this computer I could use something like:

use Term::ReadKey;
my $key = '';
ReadMode(4);
                                                                      
+          
my %keys = ( A => 'KeyUp', B => 'KeyDown', C => 'KeyRight', D => 'KeyL
+eft');
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);
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You may of course have to adjust some of the values to work on your system.

/J\