exec() function not working.

I am trying to run a shell script which prints a simple “hi”.

The warning I get is,

Warning: exec() has been disabled for security reasons in /home/vol7_1/htdocs/index.php on line 38

I have changed the file permissions to executable.

What do I do?

Executing shell scripts on free hosting is not possible (or allowed). You can only use PHP code to serve web pages on free hosting.