Binding M- / M- in Emacs 23.1.1

Question

I\'m trying to put in a feature that I miss from Eclipse, where Alt+[Up/Down] transposes the lines up or down, but can not for the life of m

Answer 1

works on OSX Terminal:

(global-set-key (kbd "ESC ") 'transpose-line-up)
(global-set-key (kbd "ESC ") 'transpose-line-down)