keyboard-shortcut

function keyCheck()
    local sTimer = "placeholder"
    local seTimer = "placeholder"
    local allowChar = false
    local shiftPressed = false
    while true do
        local event, char = os.pullEvent()
        if event == "key" and char == 42 then
            shiftPressed = true
            seTimer = os.startTimer(0.7)
        elseif event == "key" and char == 29 then
            allowChar = true
            sTimer = os.startTimer(0.7)
        elseif event == "key" and allowChar then
            local name = nil
            for k,v in pairs(keys) do
                if v == char then
                    if shiftPressed then
                    print("Ctrl+" .. "Shift+" .. k:upper())
                    else
                    print("Ctrl+" .. k:upper())
                    end
                end
            end
        elseif event == "timer" and char == sTimer then
            allowChar = false
        elseif event == "timer" and char == seTimer then
            shiftPressed = false
        end
    end
end
keyCheck()