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Editorial Team
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Asked: 2026-06-06T04:46:36+00:00

Using PHP I would like to be able to list root’s crontab. I am

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Using PHP I would like to be able to list root’s crontab.
I am able to run the following command as the Apache user from the command line and get the desired result:

sudo crontab -l

however, in my PHP I have the following command which does not work and returns an empty set:

exec('sudo crontab -l', $out);
print_r($out);

Is it environmental? Or permissions?

I have also tried shell_exec() system() and passthru()

Also, note that I have disabled SELinux and added Apache to the sudoers file so that it does not need to be prompted for a password.

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1 Answer

  1. Editorial Team

    Solved: Even though I had set error reporting on, you must redirect the output of the command like so:

    exec('sudo crontab -l 2>&1', $out);
var_dump($out);

    After setting this, I found the following error:

    sudo: sorry, you must have a tty to run sudo

    Following research of the issue, the resolution is to edit the sudoers file and comment out: #Default requiretty.

    http://www.zimbra.com/forums/installation/10553-solved-sudo-sorry-you-must-have-tty-run-sudo.html

    I apologize as I got further into this issue, it became less of a PHP issue and more of unix system question.

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