Table of Contents This text is a brief description of the features that are present in the Bash shell (version 4.2, 28 December 2010). This is Edition 4.2, last updated 28 December 2010, of The GNU Bash Reference Manual, for Bash, Version 4.2. Bash contains features that appear in other popular shells, and some features that only appear in Bash. Some of the shells that Bash has borrowed concepts from are the Bourne Shell (sh), the Korn Shell (ksh), and the C-shell (csh and its successor, tcsh).
Revised 3/2006 Bash what? Okay, I grant that this page might represent a leap from the familiar to the alien without much warning. Bash Shell Programming in Linux
What is the Bash Shell? Bash's Configuration Files Modifying the Bash Shell with the set Command BASH Help - A Bash Tutorial