setup a laravel 4.2 project to deploy to a shared hosting provider

laravel_shared_hosting_project.sh

#!/bin/bash

myproject='myproject'
mywwwdir='public_html'

# initialize project
composer create-project laravel/laravel $myproject 4.2.*
cd $myproject

perl -pi -e "s|/public|/../${mywwwdir}|" bootstrap/paths.php
perl -pi -e "s|/bootstrap|/${myproject}/bootstrap|" public/index.php

# rename the public folder to match hosting providers web root
mv public $mywwwdir

# create a directory for everything except the public directory
mkdir $myproject

# move stuff to app dir
mv {app,bootstrap,vendor,artisan,composer.*,*.php,*.xml} $myproject

From which path do i have to run this script? Where do I have to put the script in my hard disk? So that I could run it from terminal. I'm working in Mac OS X.
I mean: /Users/Lexynux/Documents/laravel_app/
or from anywhere else?

You can run it from anywhere using the terminal. Depends on where you want your projects. You will end up with 2 subdirectories within the directory it is run. If you ran it from /Users/Lexynux/Documents/laravel_app/laravel_shared_hosting_project.sh

You would end up with these directories:

/Users/Lexynux/Documents/laravel_app/public_html
/Users/Lexynux/Documents/laravel_app/myproject