Well, thats pretty recursive, I guess.

pi@raspberrypi:~ $ cat /sys/class/gpio/gpiochip0/device/gpio/gpiochip0/device/gpio/gpiochip0/device/gpio/gpiochip0/device/gpio/gpiochip0/
base device/ label ngpio power/ subsystem/ uevent

And you can go on, and on, and on like that.

What's wrong with you RaspberryPi?

It's a fresh raspbian installierbar, with the only Addition of 1wire and snmp.
I'd expect /sys/class/gpio/gpio<pinnumber>/value there.

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@alsternerd I'm not sure what you are trying to do, but did you call "echo «pinnumber» > /sys/class/gpio/export" beforehand?

And maybe you need to change /sys/class/gpio/gpio0/direction to "in" or "out", too.

The package "sysfsutils" can help to make this permanent and assign user permissions, if needed.

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@mehdorn Hm, I did try to set the pins through /boot/config.txt with
gpio=18,20=pu,ip ( pullup, input )

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