I have 2 hotkeys for dired, that work in GUI mode in Emacs:
(add-hook \'dired-mode-hook
(lambda ()
(define-key dired-mode-map (kbd \"C-\"
Your terminal likely doesn't produce different escape sequences for CTRL-right versus just right.
You can easily verify this by typing CTRL-v CTRL-right and CTRL-v right. Here, CTRL-v tells the terminal to print the escape sequence for the key that follows. If these two produce the same sequences then your terminal sends the exact same information to Emacs whether you press CTRL or not.
For instance, if I type these shortcuts in a Gnome terminal, I get:
^[[C for CTRL-v right^[[1;5C for CTRL-v CTRL-rightWhen I do the same on one of the Linux consoles, I get:
^[[C for CTRL-v right^[[C for CTRL-v CTRL-rightAs you can see, in the latter case it's exactly the same result for both key sequences, hence there's no way Emacs can distinguish the two.
The only way to fix this is to convince your terminal to send a different sequence when you hold down the CTRL key - see this question for more information.
An easier work-around would be to simply use different key bindings in Emacs.