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I have a fleet of raspberry pi's running as access points. I set the default SSID and PASSWORD using a simple bash script that runs at boot. I get unique values for this:

SSID = cat /sys/class/net/wlan0/address | tail -c 10 | tr -d ":"

PW = cat /proc/cpuinfo | tail -c 9

I just echo the results on the hostapd file, everything work just fine, each Raspberry Pi get unique SSID and PW. Now I need to generate a JSON file with this values (via bash) in a format like this. 

{
  "wifi": {
    "ssid": "SSID",
    "pw": "PW"
  }
}

Can anyone shed some light on this?

Regards

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  • Depending on the size of your 'fleet' you might find that Ansible gives you a greater level of configuration control than bash scripts alone.
    – Tom O'Connor
    Commented Sep 11, 2017 at 14:53
  • Hey, Tom, thanks! This is for "LAB" only. We are using Resin.io to get it done, but for now i just need to give the dev team this json with ssid and pw.
    – Juliano Piassa
    Commented Sep 11, 2017 at 14:58

1 Answer 1

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5

Heredocs perform variable expansion, so you can do something like

SSID=$(cat /sys/class/net/wlan0/address | tail -c 10 | tr -d ":")
PW=$(cat /proc/cpuinfo | tail -c 9)

cat >./config.json <<EOF
    {
      "wifi": {
          "ssid": "$SSID",
          "pw":   "$PW"
      }
    }
EOF
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