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You could try using 'sed'...
To replace 'bob' with whatever's in the variable $jim, do:

#/bin/sh
jim=<some-calculation>
cat <filename> | sed "s/bob/$jim/g"

It's a lot nicer... :)

NB: If...

Most systems have 'chsh' setuid anyway, so changing your shell
shouldn't be a problem. (usermod isn't setuid).

By 'normal file' you mean what exactly? (install-unix.exe?)

ISO images are by far the most common distribution method for
unix/linux (and bsd!) systems.

The ISO is ready to burn onto CD, so...

By session, I take it you mean a normal login session through the likes of ssh or telnet?...

Luckily this can all be done through environment variables... For example:

To kill the session after...