Question

I am trying to Execute a multiple commands in php using exec() and shell_exec but i am getting a null value back which i shouldn’t and nothing is happening (if i copy and paste the strings below in the command line it will work fine and accomplish the job needed) this is the commands i am using:

$command = "cd /../Desktop/FolderName;";
$command .= 'export PATH=$PATH:`pwd`;';
$command .= 'Here i execute a compiler;';

and then i use the escapeshellcmd()

$escaped_command = escapeshellcmd($command);

then

shell_exec($escaped_command);

any ideas what i am doing wrong and i also tried escapeshellarg() instead of escapeshellcmd()?

Solution: the Problem was the permission of the execution compiler for other owners is non and this was the problem.
because when you are using exec() function in php the owner of the file will be www-data so you need to give permission for the www-data either from the ACL of ubuntu or whatever linux based operating system(you can know the owner by doing this exec('whoami')), or by the files you need to execute.

Answer 1

(Sorry my bad English)
On Linux you can add your Commands in a Shell Script.

You can put this in any file:

#!/bin/bash
cd /../Desktop/FolderName
export PATH=$PATH:`pwd`
EXECUTE COMPILER

And save this as fille.sh

Then, add execution permissions:
chmod +x path/to/file.sh

From PHP, you can call this Script executing:
shell_exec(‘sh path/to/file.sh’);

Hope this helps!