xmodmap:tldr:b437e

The command "xmodmap" is used in Linux to modify the keymaps of the keyboard. It allows you to remap or reassign various keys on your keyboard.

The specific command you mentioned, "xmodmap -e 'keycode ${keycode} ='", is a command to modify a specific keycode to a new value.

In the command, "${keycode}" is a placeholder for the actual keycode value that you want to modify. You need to replace "${keycode}" with the actual keycode you want to change.

For example, if you want to remap the keycode for the "A" key, you would use the actual keycode value in place of "${keycode". Let's assume the keycode for "A" is 38. So, the command would be:

xmodmap -e 'keycode 38 ='

This command would remap the keycode 38 (which corresponds to "A") to a new value. However, since you have not specified any value after the equals sign, the key will have no function assigned to it.