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David Korn (computer scientist)
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== Education and work == {{BLP unsourced section|date=May 2014}} David Korn received his undergraduate degree in [[mathematics]] from [[Rensselaer Polytechnic Institute]] in 1965 and his Ph.D. in applied mathematics from [[New York University|NYU]]'s [[Courant Institute of Mathematical Sciences]] in 1969. After working on computer simulations of transsonic airfoils and developing the Korn airfoil,<ref>http://aero-comlab.stanford.edu/Papers/Garabedian.pdf {{Bare URL PDF|date=March 2022}}</ref> he switched fields to computer science and became a member of technical staff at [[Bell Laboratories]] in 1976. He developed Korn shell in response to problems he and his colleagues had with the most commonly used shells at the time, [[Bourne shell]] and [[C shell]]. The Korn shell pioneered the practice of consultative user interface design, with input from Unix shell users, and from mathematical and cognitive psychologists.{{citation needed|date=November 2015}} The user interface, which included a choice of editing styles (the choices included styles based on vi and on two variants of Emacs) was incorporated into, or copied by, most subsequent Unix shells. The Korn shell is [[backward-compatible]] with Bourne shell, but takes a lot of ideas from C shell, such as history viewing and [[Vi (text editor)|vi]]-like command line editing.
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