execute script when network interface is up

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http://askubuntu.com – 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. (HowTos)