Which lists all of the GPIO controllers that are installed: The standalone applications that are installed are: To do this you need to first install them and the gpiod library that you will use later: sudo apt-get install gpiod libgpiod-dev libgpiod-doc If you do want to explore the GPIO from the command line, you need to install some tools that have been created mainly as examples of using the new device interface.
In this case reading and writing to the file will do you little good as most of the work is carried out using the ioctl() system call which cannot be used from the command line. If you know how sysfs works you might well be expecting instructions on how to read and write to the file from the console.
This represents the main GPIO controller and all of the GPIO lines it provides. If you look in the /dev directory you will find files corresponding to each GPIO controller installed. The new approach to working with GPIO comes pre-installed in the latest version of Pi OS – it isn’t supported in earlier versions.
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