CODE EXAMPLE FOR SHELL

raspberry pi how to add multiple networks to headless

//Follow the instructions from the raspberry pi website and just literally add another
// network below the one you just added :)
// https://www.raspberrypi.org/documentation/configuration/wireless/headless.md

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

network={
    ssid="SCHOOLS NETWORK NAME"
    psk="SCHOOLS PASSWORD"
    id_str="school"
}

network={
    ssid="HOME NETWORK NAME"
    psk="HOME PASSWORD"
    id_str="home"
}