How to loop queue checking code? [closed]

Question

Possible Duplicate:
Disconnect modem when postfix queue empty

This script code checks to see if the postfix mail queue empty and if true it disconnects my modem.

#!/bin/sh
postqueue -p|grep empty
if [ $? -eq 0 ]; then
  killall wvdial
fi

I need to run it many times as needed until the mail queue gets empty.

How can I loop it?

Maybe placing an else that returns to execute the script from the line of postqueue -p|grep empty ?

I know it can be simple but am not too much expert in bash scripting so I need help to complete this code.

Answer 1

#!/bin/bash
while ! postqueue -p | grep -q empty; do
    sleep 1
done
killall wvdial

Answer 2

Is this what you're looking for?

while postqueue -p | grep -q empty; do
    killall wvdial
    sleep 1
done

Answer 3

This code works even better (as it is faster on large queues):

while [ `find /var/spool/postfix/{deferred,active,maildrop}/ -type f | wc -l` -gt 0 ]; do
    sleep 5
done
killall wvdial

And note that this question is a duplicate of your own question.