Swap both left and right Control and Alt keys on Linux

swap-ctrl-alt-keys

#!/bin/bash

# Create or append to .Xmodmap the new
# mappings for Control and Alt
echo '
clear control
clear mod1
keycode 105 = Alt_R
keycode 108 = Control_R
keycode 37 = Alt_L Meta_L
keycode 64 = Control_L
add Control = Control_L Control_R
add Mod1 = Alt_L Meta_L' >> ~/.Xmodmap

# Activate the changes now
xmodmap ~/.Xmodmap

# Set it to keep the changes at startup
echo '
# On startup, swap Alt and Control
if [ -f $HOME/.Xmodmap ]; then
  /usr/bin/xmodmap $HOME/.Xmodmap
fi' >> ~/.profile