Sorry for being unclear. xev is a command you type at the terminal, ditto
xbindkeys. The xev command brings up a little white box, move the cursor
inside it. Now you'll see some output in the terminal window you launched xev
from. Part of that output is keysyms for the keys you press.
I can't remember whether xev and xbindkeys are installed by default but the
xbindkeys command is from a package with the same name and the xev command is
from x11-utils package. So you need to install those packages.
The whole operation probably requires manual page reading, e.g.man
xbindkeys(after you've installed xbindkeys)
