showkey

Display the keycode of pressed keys on the keyboard, helpful for debugging keyboard-related issues and key remapping. More information: https://manned.org/showkey.

View keycodes in decimal:

sudo showkey

Display scancodes in hexadecimal:

sudo showkey {{[-s|--scancodes]}}

Display keycodes in decimal (default):

sudo showkey {{[-k|--keycodes]}}

Display keycodes in ASCII, decimal, and hexadecimal:

sudo showkey {{[-a|--ascii]}}

Exit the program:

<Ctrl d>