Why Permission denied while using exec command(while writing to the log file )?

Question

In my local machine I am used exec command as below :

 if($serverHost == "api.frapi") 
 {
     $phpBianryPath='/Applications/MAMP/bin/php/php5.4.10/bin/php';
 }
 else
 {
     $phpBianryPath='/usr/bin/php';
 }

 $logDir= dirname(__FILE__). '/BackgroundTask';                
 exec("$phpBianryPath $logDir/notificationCall.php $token >> $logDir/log_file.log 2>&1 &");

It works perfect in my local machine.But when I upload it on production server and then try to use it then it gives error as below:

sh: /var/www/html/example/src/frapi/custom/Action/BackgroundTask/log_file.log:
Permission denied

Please Guide me on this.I don't understand why it is not working in production?

Answer 1

You don't have the necessary rights to execute that file. If the server you're running the script has linux use the chmod command to change file permissions.

chmod 0764 /var/www/html/example/src/frapi/custom/Action/BackgroundTask/log_file.log

4 = read;

2 = write;

1 = execute;

read+write+execute = 4+2+1 = 7;

764 means rwx for owner, rx for group, r for others.

For further documentation please refer to: https://help.ubuntu.com/community/FilePermissions