Help changing permissions using a shell script

Hey,
Here's the situation. We have 18 Macs, they're all cloned from a master image and have 2 local accounts - Administrator and Student.
There are some files on the machines that the student account does not have permission to access, but it's critical that they do. I've written a shell script to change the files so that everyone has permission to read, write and execute them:
#! /bin/bash
clear
sudo chmod ugo+rwx /Library/Audio/Plug-ins/Components/FM8.component
sudo chmod ugo+rwx /Library/Audio/Plug-ins/VST/FM8.vst
sudo chmod ugo+rwx /Library/Audio/Plug-ins/VST/FM8\ FX.vst
sudo chmod ugo+rwx /Library/Application\ Support/Digidesign/Plug-ins/FM8.dpm
In theory, this means I can just run the script, type the admin password in once and its done (as opposed to typing in the password 4 times and navigating to each file individually.)
However, this doesn't quite work as planned.
If I run the script, navigate to the files using the Finder and 'get info' it declares that "Everyone" can "Read & Write". The student account can see the file properly, but the finder just thinks there's nothing there (Size=Zero KB.) Only when I explicitly add the Student account (Add->Student) and set it to "Read & Write" does it start working.
2 questions really - Why does it do this, and how do I make it work?
It was my understanding that if everyone could read, write and execute there wouldn't be a problem, regardless of which account tries to access the file?
Also, if there is a better/easier/faster way of doing the same thing I'm open to suggestions.
Thanks.

Thanks Tony,
Your reply was helpful, I didn't realise you could tie all the paths together and just use one chmod command.
I actually solved the issues myself this morning (fresh head on after a good nights sleep!)
It turns out the 'files' I'm trying to modify aren't strictly files at all, they're packages. Using just chmod changes permissions for the top of the package only (hence why I could see the files but they said Zero KB.)
adding -R to the chmod modified permissions to everything inside the package as well, which has resolved the issue.
Thanks for the help though!

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Help changing permissions using a shell script

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