[PHP] Passthru with Grep and Awk?

[Carlton L. Whitmore]

I'm having problems getting the following passthru statement to work. It
works fine with the just the grep command.
Help!!!!  
 
<?php
echo "<pre>\n";
passthru('/usr/bin/grep " c=2048" " c=32" " c=2" /var/log/messages |
/usr/bin/awk "{print $1 $3 $5}" ');
?>