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.

1 Answer 1


Try doing this :



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

# send sms

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

  • It worked greate ! thank you , but it seems there is a litle bug calling my script on the bottom (before "exti 0" of course) of /etc/rc.local , when i receive the sms the time is on 0 unix timestamp :/ NOTE : i receive the sms using my provider's mail (smtp) that send's my the subject on sms Apr 3, 2013 at 5:50

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