A usefull command if are want to read keyboard input :
showkey. Very useful to know keycodes when programming.
What is showkey ?
showkey - examine the codes sent by the keyboard
How does it work ?
showkey have only 3 options (4 with help) :
-s --scancodes: Starts showkey in scan code dump mode.
-k --keycodes: Starts showkey in keycode dump mode. This is the default, when no command line options are present.
-a --ascii: Starts showkey in `ascii' dump mode.
Note : Only
-a will fully works on X mode (with a graphical terminal),
-k mode may work on X mode if you have root permissions else use a text console (TTY 1 to 6).