OSX Darwin Scripting problems

Im sure this is a pretty easy question, but Ive had some problems writing a script for the Unix environment on my Mac. I eventually want to write a script so that when a user logs in via ssh they are directed to a directory other than their home and some aliases get set up etc. Unfortunately I cant even get a basic script to change directory to work. My file shows as follows:
!/bin/sh
cd ..
There is a directory for it to go to, but it wont go up one directory. I had also tried to get it to direct to the specific directory that I want it to. I dont know why this wont work and Im sure its something stupid, but I couldnt figure it out.
I did have a script work that I found in an online tutorial that looks like the following:
#!/bin/sh
osascript -e 'tell application "Finder"' -e "activate" -e "display dialog \"hello\"" -e 'end tell'
I dont know if there is something I am missing about that script that I dont have in my script (I tried adding "osascript" to mine but it didnt help). Again, Im sure its a stupid question but I have been having trouble with it. Thanks to anyone who helps with this.
PowerMac G5 Mac OS X (10.4.2)

Im sorry for bringing up all these questions. Thanks for all your help with it.
With the old HP, when a user would connect via ssh, the shell would automatically run the user's .login file, which was modified to direct the user to a directory other than their own, set up some aliases to be used by the user for running some scripts, and would set paths for various things such as IDL etc. For example it would set "alias sim /codes/scripts/SIM" in a script and then the user would later be able to just type "sim" to run the script SIM.
In Darwin I havent been able to do that because, as you said before, the aliases are only around for as long as the script is running. I can modify the ~/.ssh/rc file to get the script to run on login just fine, I just cant get the effects to exist outside the scripts process space
Again, sorry to keep going on and on with this question, and Im sure Im explaining things you already understand perfectly well, I just want to be sure to explain what we are doing as best I can.
Thanks a bunch for your time and everything.

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