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The script doesn't run exactly as if you typed in the commands yourself... When it's done, it's returning you to where you were. You can check this by sticking a new line in the script before and after the cd...
echo $PWD
This will print out the current directory the script is in. You will see that it starts in your current directory, then moves to root.
This will run the script in the current shell. By default your scripts run in a new shell which gets destroyed when it's done. That is why your environment is unchanged.
2. Write an alias for your utility rather than a script. I haven't done this with bash but it works for ksh. Look for 'alias' in the bash man page.
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