How to map # to ~ in gnome-terminal?

Question

The ~ key of my laptop is broken, now I am seeking a method to map the # to it? How could I do it?

Answer 1

Keycode of 3/# key is 12:

]$ xmodmap -pk | grep "(3)"
    12         0x0033 (3)      0x0023 (numbersign)     0x0033 (3)      0x0023 (numbersign)

(xmodmap -pk displays current mapping)

You need to change mapping of this key when pressed with shift so it produces ~ instead of #. You do this like this:

echo "keycode 12 = 3 asciitilde" >> ~/.Xmodmap
xmodmap ~/.Xmodmap

In order to reset mapping back to original you remove above line from ~/.Xmodmap and do:

]$ xmodmap -e "keycode 12 = 3 numbersign"