Automatic/Push Button site folder/vhost creation in Linux via CI/PHP

[eluser]n0xie[/eluser]
[quote author="Devon Lambert" date="1274390710"][quote author="n0xie" date="1274364339"]You can just write a bash script, then call that from within PHP. This is my addsite.sh I call when starting a new project which takes care of vhost and hosts file[/quote]

Hey Noxie,

Does this code actually make an addition to the existing vhost/host files OR does it create a new vhost/host file for each site?
[/quote]
It creates a new vhost for every file.

i.e. How do you tell the script that your adding www.mygreatnewsite.com to the file

It accepts a parameter, which is the name of the site. In my case ./addsite www.mygreatnewsite.com, creates www.mygreatnewsite.com. It copies my template vhost file then replaces all instances of the word 'site' with the actual site name.

how does it know that this new site is supposed to reference the same ip address as every other site already on file?

I don't really understand the question: you tell your vhosts what url belongs to it and apache takes care of the rest. The ip part is usually done using dns.