WHILE TRUE

while true is an infinite loop. It ends only with the break command or when the script is ended (e.g. using terminate_this_script).

It is often used to create a main body of a CLEO script, which contantly awaits for a key press to trigger some action.

while true
    wait 0
    if
        is_key_pressed 113 // F2
    then
        break
    end

    add_score {player} 0 {money} 10
end
terminate_this_script

This loop adds $1 to the player’s account each frame until the F2 button is pressed to exit the loop. Note that after breaking from the loop, the script continues to the next command, which is terminate_this_script.