bash
Bourne Again SHell. GNU's command interpreter for Unix. Bash is a Posix-compatible shell with full Bourne shell syntax, and some C shell commands built in. The Bourne Again Shell supports Emacs-style command-line editing, job control, functions, and on-line help. Written by Brian Fox of UCSB.
The latest version is 1.14.1. It includes a yacc parser, the interpreter and documentation.
ftp://ftp.gnu.org/bash-1.14.1.tar.gz or from a GNU archive site. E-mail: <bug-bash@gnu.org>. Usenet newsgroup: news:gnu.bash.bug.