Ellie Quigley is the author of many best-selling books on Linux shells, UNIX shells, and Perl programming. A leading instructor and trainer, her courses in Perl and UNIX shell programming at the University of California Santa Cruz Extension Program, Sun Microsystems, and numerous corporations and colleges have become legendary throughout Silicon Valley. Quigley's company, Learning Enterprises, Inc., offers on-site training in Unix, Perl, C/C++, Java, and system administration.