[citation needed] 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.
Microsoft once included a version of the Korn shell produced by Mortice Kern Systems (MKS) in a UNIX integration package for Windows NT.
A polite debate ensued, with Sullivan continuing to insist that the man giving the criticisms was mistaken about the compatibility issues.
Sullivan only backed down when an audience member stood up and mentioned that the man making the comments was none other than the eponymous David Korn.
[citation needed] He currently lives in New York City, and until 2013 worked for AT&T Labs Research in Florham Park, New Jersey,[7] and he retired from Google in early February 2018.