Is there a way to start a bash script after boot only when wlan0 is connected

Question

i want to start a bash script in ubuntu after boot. But the script should run first after wlan0 device is connected to my wifi.

How can i achieve this?

Answer 1

I'd start it at boot and let it wait until wlan0 is connected. You can check this via

#!/bin/bash

while true; do
    # testing...
    LC_ALL=C nmcli -t -f DEVICE,STATE dev | grep -q "^wlan0:connected$"
    if [ $? -eq 0 ]; then
        break
    else
        # not connected, sleeping for a second
        sleep 1
    fi
done

# now connected, run the script

Answer 2

In Ubuntu you can use upstart for this. Save the following as /etc/init/yourscript.conf

start on net-device-up wlan0

exec  your_script