如何根据键盘活动在终端模式下自动启动脚本？

I have a box running Debian command line only, and attached to a monitor. It is always on, displaying its terminal screen on my mini LCD monitor. I want a screensaver for the terminal, and seem to have found one (cmatrix, aafire). I just dont know how to launch the screensaver after 60 minutes of no keyboard input on the local monitor. I have a box running Debian command line only,