Yeah. That is a problem with older Raspberry Pis, which do not have a keyboard. It is possible to use a GPIO port for this, and shut it down with an attached bu

Yeah. That is a problem with older Raspberry Pis, which do not have a keyboard. It is possible to use a GPIO port for this, and shut it down with an attached button. But one has to be careful not to use the port unless it is configured properly, because that could cause a short-circuit, and the R-Pi is not protected against that. Having a keyboard on which you can type Ctrl-Alt-Del is much easier to use and will work on most relevant circumstances. In modern Raspian editions, this can be configured in systemd.