Hello, I think you've already gotten good answers about the book, and how bash is derived from bourne, and what ksh and csh are.
While you're learning about the shells, I think it's important to keep this in mind: http://www.faqs.org/faqs/unix-faq/shell/csh-whynot/ It's good to learn csh in order to be able to understand random csh scripts you find in the wild, but read that document before you ever consider unleashing another csh script unto the world. good times, Vineet -- http://www.doorstop.net/ -- "Computer Science is no more about computers than astronomy is about telescopes." -- E.W. Dijkstra
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