BASH shell is default on many UNIX / Linux systems. There is an interview with Chat Ramney, maintainer of BASH, the Bourne Again Shell. He talke about his experience maintaining Bash and few other things. From the page:
Bash, or the Bourne-Again Shell is a Unix shell created in 1987 by Brian Fox. According to Wikipedia, the name is a pun on an earlier Unix shell by Stephen Bourne (called the Bourne shell), which was distributed with Version 7 Unix in 1978.
In 1990, Chet Ramey, Manager of the Network Engineering and Security Group in Technology Infrastructure Services at Case Western Reserve University, became the primary maintainer of the language.
Computerworld tracked down Ramey to find out more.