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A shell is what many people think of when they hear about
Unix; however it is only a program that makes use of the Unix
environment. A shell is usually a small program that does
nothing more than allow you to call other programs, however a
shell can be just about any program, and in some cases even a
shell script. The main responsibility of a shell is to take
input in the form of commands and execute those commands; the
shell is the user interface to the system.
On the cluster you may change your shell from the default csh
to any number of other shells such as sh, ksh, tcsh or even
others with the command chsh.
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