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I tried the rpi-imager tool for the first time to write RPiOS to an SD card. I've always just used dd and then manually edited the cmdline and config files in boot/. I entered my WiFi information in the GUI and wrote to the SD card, stuck it in and the RPi came online and connected to my network, but I want to know where the rpi-imager GUI writes the WiFi information.

It's not where I expect:

$ sudo cat /etc/wpa_supplicant/wpa_supplicant.conf

ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1

but the Pi is definitely online and connected to my network!

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Figured it out:

/etc/NetworkManager/system-connections

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    This may be where NetworkManager (which is 10 years old and well documented) saves its connections but it is NOT put there by rpi-imager (because it can't). If you look at the boot sector (before 1st boot) you will see a file which is installed by a task that runs on boot.
    – Milliways
    Oct 21, 2023 at 23:31

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