Ubuntu – Execute script when network interface is up

bashdebianraspberrypiscripts

i have this piece of bash script :

internal=$(/sbin/ifconfig $adapter | grep "inet addr" | awk -F: '{print $2}' | awk '{print $1}')

$adapter="eth0"
i want to execute this until internal has the correct value
and after that i want to go to the rest of my script
Do you have any ideas how i could deal with that ?

After that i have code it in order to send the ip via sms !

Thank you in advance.

Best Answer

Try doing this :

#!/bin/bash

PATH+=/sbin
adapter=eth0
internal=""

until [[ $internal =~ [0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3} ]]; do
    sleep 1
    internal=$(
        ifconfig "$adapter" |
        awk -F'(inet add?r:| +|:)' '/inet add?r/{print $3}'
    )
done

# send sms

As you can see, I use only one pipe : | with awk, no need more, awk can do the whole processing.

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That should work. I've run into this same problem and running my script with sh fixed it.

Also, you may want to delay it for 5 or 10 seconds so everything else can load. To do this, go to ~/.config/autostart, find your new entry, open it with a text editor, and add the line:

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