Question: Whenever I run any `php artisan` command like `php artisan list`, I get nothing back. No commands work at all.

I have been searching a little around, and have tried the following:

* changing permissions for `/root/.composer` to 777
* remove `bootstrap/compiled.php` file

There is nothing in `app/storage/logs/log-cli-.txt`.  

I can view the site in the browser.

I'm running on CentOS 6.3 64bit with PHP v. 5.5.11 - Laravel 4.1

Answer: 
Running `composer install` solved the problem.
The solution for me was like @TheodoreR.Smith mentioned, there was an `exit` in a controller's `__construct()`. I removed it and `route:list` worked fine.