Juniks ljuska — разлика између измена

* {{Cite book |ref= harv|title=Unix Shells by Example|author=Ellie Quigley|date=2001|publisher=Prentice Hall PTR|id=ISBN 0-13-066538-X|chapter=Introduction to UNIX shells}} – -{a history of the various shells, and the uses of and responsibilities of a shell on Unix}-