结果表单crontab与手动执行不一样？

Question

I have a PHP script that execute some shell commands.

Once I manually executed it. It worked very fine.

But after I used crontab to execute, the result from some shell commands are missing.

These are 2 commands.

• ip route
• iptables -t nat -L | grep 8800

and here is a sample PHP code.

#!/usr/bin/php -q
<?
    $route = exec('ip route');
    $iptable = exec('iptables -t nat -L | grep 8800');
    echo $route;
    echo $iptables;
?>

The above code worked well with manually execute but not crontab.

I found that some commands worked well with both. For example

• ifconfig eth0 | grep 'inet addr:' | cut -d: -f2 | awk '{ print $1}'
• cat /tmp/example | grep test

Any ideas for this problem, and thank you in advance.

Answer 1

Pay attention to what user runs the script. May be the user (which you add crontab task) haven't got enough permissions.