This page points to introductions to the most useful utilities we have in the Unix environment on our Sun system, from the point of view of the usefulness for physics. Some of these are also available on platforms other than the Suns. Towards the end there is another list of information about less often used utilities.
Note that some of these documents are prepared for use elsewhere and may not exactly fit the environment of the Physics Department.
Here are some more pieces of information which are available, about less commonly used topics.