UNIX is the operating system that is used on Wesleyan's SUN and SGI computer systems. The handout Introduction to UNIX at Wesleyan University explains the basics of UNIX: how to log in; how to use commands; how to create, modify, and use files; how to print; and how to maintain a UNIX account. If you are not already familiar with the information contained in that handout, we suggest you study it before proceeding. This handout expands on the information contained in Introduction to UNIX at Wesleyan University.