Our clusters use the Linux Operating system System as their core together with some add-on tools provided by the San Diego Super Computing Center. Together the complete package is known as ROCKS. Since UNIX is the core of the operating system part of the process of wielding the power of the cluster is learning how use the various UNIX provided, and other commands to manipulate your data.
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To use 3rd party software we have added, you will want to learn to use the module command. You can also see the software that we have available on our systems.
Here is a A Little UNIX Dictionary which will let you use many of the buzzwords that you hear.
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For more cluster specific information, our Documentation page has a link for Cluster Specific Documentation.
Here is a tutorial showing how to manage disk space in UNIX.