Different shells offer different levels of functionality, but fundamentally perform the same task.
You can change your UNIX shell by typing chsh at the UNIX prompt. You will be presented with a list of available shells, and their respective path. Make sure that you enter the entire path as shown in the list. Customizing Your UNIX Environment For most users, the default settings in their UNIX environment will be adequate. Settings in UNIX are accomplished through initialization files in the user's home directory.