# Changing letter o with lookalike letter σ

1. Run in terminal    xmodmap -pke
2. Find keycode for O. (on my computer it´s 32)
3. Run     xmodmap -e "keycode 32 = Greek_sigma Greek_SIGMA"
4. To restore to default, run   xmodmap -e "keycode 32 = o O"

(Thanks to: yellowantphil on stackoverflow[dot]com)