exec command help

I am trying to run a something everytime a certain page is loaded. I am using PHP4 and am running Debian Linux. I am trying to run this command with exec: exec("/usr/sbin/postalias hash:aliases", $results); In case you are curious this turns a file called aliases into a hashed aliases file (aliases.db) so that postfix (a mail program), can look at this aliases file. I put this in a page and the page loads with no errors, but the command doesnt look like it was ever run. If I check the aliases.db file the modified date is never right. Any thoughts or suggestions on what is going on or howto debug this so I can get more information (I have been echoing the results but nothing comes up). Thanks for you time. -- ------------------------------- Clayton Bluhm Computer Engineering Student nashirak@email.com (home)