Quigley has thoroughly updated her classic with this fourth edition, which delivers the information today’s shell programmers need most–including comprehensive coverage of Linux shell programming with bash 2.05.  Drawing on 20 years’ experience as a shell programming instructor, Quigley guides the student through every facet of programming all leading Unix/Linux shells: bourne, bash, korn, C, and tcsh. Quigley illuminates each concept with up-to-date, classroom-tested code examples designed to help the student jump-start their projects. She also systematically introduces awk, sed, and grep for both UNIX and GNU/Linux.