The Bash Shell (/bin/bash) version 2.0, came about in 1988.

Also known as the "Bourne Again Shell" after Steven Bourne's shell, the bourne shell (/bin/sh), which came about in 1979.

It is part of the GNU project, www.gnu.org, started by Richard Stallman, of the Free Software Foundation, www.fsf.org.

The Bash Shell conforms to the POSIX standard (Portable Operating System Interface).