Descendants
These features could not overcome the shortcomings of the Thompson shell, and so a new shell was written from scratch by Stephen Bourne. This Bourne shell was incompatible with the Thompson and PWB shells, but included equivalents of most of the PWB shell's features, but done from scratch, rather than incrementally, with much discussion among the various participants. In particular, Environment variables and related machinery were designed by Stephen Bourne, John Mashey, and Dennis Ritchie as a general mechanism to replace the earlier, more limited features. After the adoption of the Bourne shell as the standard shell in Version 7 Unix, use of the PWB shell was phased out, although for a while, there was an internal Bell Labs course called Bourne Shell Programming for Mashey Shell Programmers. (The C shell, developed before the public release of the Bourne shell, also inherited some of the features of the PWB shell.)
Read more about this topic: PWB Shell
Famous quotes containing the word descendants:
“And what if my descendants lose the flower
Through natural declension of the soul,
Through too much business with the passing hour,
Through too much play, or marriage with a fool?”
—William Butler Yeats (1865–1939)
“The descendants of Holy Roman Empire monarchies became feeble-minded in the twentieth century, and after World War I had been done in by the democracies; some were kept on to entertain the tourists, like the one they have in England.”
—Ishmael Reed (b. 1938)
“I call heaven and earth to witness against you today that I have set before you life and death, blessings and curses. Choose life so that you and your descendants may live...”
—Bible: Hebrew, Deuteronomy 30:19.