How to run shell_exec command in php

https://unix.stackexchange.com/questions/115054/php-shell-exec-permission-on-linux-ubuntu

The Apache’s user www-data need to be granted privileges to execute certain applications using sudo.

  1. Run the command sudo visudo. Actually we want to edit the file in etc/sudoers.To do that, by using sudo visudo in terminal ,it duplicate(temp) sudoers file to edit.
  2. At the end of the file, add the following ex:-if we want to use command for restart smokeping and php command for another action in your question,

www-data ALL=NOPASSWD: /etc/init.d/smokeping/restart, usr/bin/php

(This is assuming that you wish to run restart and php commands using super user (root) privileges.And you use php command in usr/bin/ path )

However, if you wish to run every application using super user privileges, then add the following instead of what’s above.You might not want to do that, not for ALL commands, very dangerous.

www-data ALL=NOPASSWD: ALL

3.After edit the sudoers file(by visudo we edit the temp file of sudoers so save and quit temp file(visudo) to write in sudoers file.(wq!)

4.That’s it, now use exec() or shell_exec in the following manner inside your xxx.phpscript.keep remember to use sudo before the command use in the php script.

ex:-

exec ("sudo /etc/init.d/smokeping restart 2>&1");

or

shell_exec("sudo php -v"); 

So in your problem,add the commands that you wish to use in to the step no (2.) as I add and change your php script as what you want.

here is the same problem as yours http://stackoverflow.com/a/22953339/1862107

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