Xmodmap - how do I use ctrl as a modifier?

Question

Basic keyboard layout:

1 → 1
Shift+1 → !

I would like: Ctrl+1 → ¹. (Superscript one character). The following code allows me to type ¹, but only with Shift+1:

xmodmap -e "keycode  10 = 1 onesuperior"

Conclusively, I would like to keep Shift+1 for ! and Ctrl+1 for ¹.

Apparently not without losing Ctrl as ctrl: http://superuser.com/q/443050/334516 — muru, Jun 01 '15 at 20:05
Are you looking to map specific keys or Right CTRL key as AltGr lvl3 shift where Left CTRL as standard CTRL modifier? — user.dz, Jun 02 '15 at 10:49
I do know how to map different keys, I do want to use ctrl as a modifier, but want to keep it as ctrl. However, looking at both your answers, it appears that that may be my only choice in the end. — TuxForLife, Jun 02 '15 at 22:19

score 2 · Answer 1 · edited Apr 13 '17 at 12:23

This seems to me very related to:

How do I assign a keyboard shortcut that uses AltGr as a modifier key?

Keep Right Alt or AltGr as ISO_Level3_Shift and try to use it as Alt Modifier too.

Where in your case is reverse: Keep Right Ctrl or Left Ctrl as Control Modifier and an extend it to be used a Level Shift.
I couldn't get it to work in both functions, one trial was by adding actions: (Doesn't work)
```
key <RCTL> {
         type= "ONE_LEVEL",
         symbols[Group1]= [ ISO_Level5_Shift ],
         actions[Group1]= [ SetMods(modifiers=Control) ]
};
```
from xkb - problems using virtual keys and ISO_Level3_Shift key but it just works one way only.

Possibly, someone knowing XKB very well can make such setup.
One setup that works for me: (no key repeat)
1. Install and setup xbindkeys & xautomation as in How can I change what keys on my keyboard do? (How can I create custom keyboard commands/shortcuts?)
2. Add this lines to ~/.xbindkeysrc
```
"usleep 150000; xte 'keyup Control_L' 'str ¹' 'keydown Control_L'"
  m:0x4 + c:10
  control + 1
```
  For me, I have ¹ with AlgGr. So I could use this too:
```
"usleep 150000; xte 'keyup Control_L' 'keydown ISO_Level3_Shift' 'key 1' 'keyup ISO_Level3_Shift' 'keydown Control_L'"
```
3. Restart xbindkeys daemon
```
pkill xbindkeys;xbindkeys
```

score 0 · Answer 2 · edited Jun 30 '18 at 22:09

You can use xev command and then push Ctrl key, then see the keycode, for example mine is "keycode 37" for Ctrl.

However I didn't think superscript will work in editor nor terminal/console and anything except word processor. Superscript and subscript exist in word editor (LibreOffice, Ms Word, etc) but, for example, in Latex we use underscore "_" for subscript and ^ for superscript.

Xmodmap - how do I use ctrl as a modifier?

2 Answers2