1. The Bourne Again Shell and is based on the Bourne shell, sh, the original command interpreter.

2. Descended from the Bourne Shell, Bash is a GNU product, the "Bourne Again SHell." It's the standard command line interface on most Linux machines. From Linux Guide @FirstLinux

3. Bash is a GNU project sh-compatible shell or command language interpreter. Bash (Bourne Again shell) incorporates useful features from the Korn shell (ksh) and the C shell (csh). Most sh scripts can be run by bash without modification. Bash offers several improvements over sh, including command line editing, unlimited size command history, job control, shell functions and aliases, indexed arrays of unlimited size and integer arithmetic in any base from two to 64. Bash is ultimately intended to conform to the IEEE POSIX P1003.2/ISO 9945.2 Shell andTools standard.Bash is the default shell for Mandrake Linux. You should installbash because of its popularity and power. You'll probably end up using it. From Mandrake 9.0 RPM

4. The GNU Bourne Again SHell Bash is an sh-compatible command language interpreter that executes commands read from the standard input or from a file. Bash also incorporates useful features from the Korn and C shells (ksh and csh). Bash is ultimately intended to be a conformant implementation of the IEEE POSIX Shell and Tools specification (IEEE Working Group 1003.2). From Debian 3.0r0 APT