Linux is an Open Source software created by a loose coalition of dedicated programmers and distributed for free or in low-cost packages. It provides a powerful and stable operating system on inexpensive PC hardware. Linux is know for having a steep learning curve, and administrators need to quickly achieve a high degree of expertise in order to configure, secure, and administer their systems effectively. This text aims to get administrators up to speed on Linux quickly. It is part of the Craig Hunt Linux Library - an eight-book set that provides in-depth, advanced coverage of the key topics for Linux administrators.