Change Keybindings for Emacs-like Editing

Move left-ctrl to left-alt

Contents of .Xmodmap

clear Mod1

clear Control 

clear Mod2 

keycode 64 = Control_L Control_L Control_L Control_L 

keycode 37 = Alt_L Alt_L Alt_L Alt_L 

keycode 108 = Alt_R Alt_R Alt_R Alt_R 

keycode 127 = Num_Lock 

add Mod1 = Alt_L Alt_R 

add Control = Control_L Control_R 

add Mod2 = Num_Lock

Make effective without loging in
xmodmap ~/.Xmodmap

Save current keybindings
xmodmap -pke > ~/.Xmodmap-original

Source:

Dustin Lacewell http://ldlework.com/