Related link: http://slashdot.org/articles/01/02/06/2030205.shtml
In a Slashdot interview, David Korn discusses
his own Korn Shell, and its place in Unix history and philosophy. He compares ksh with other shells (bash, c, bourne) and considers different implementations of the Korn shell under Linux. Most versions of the Korn Shell are derived from an older code base, and the newer version (ksh93) has been proprietary to AT&T until recently. Source and binaries for the Korn Shell (ksh93) are now available for download from AT&T. Korn’s recent work has been develoted to the UWIN project, an effort to create a Unix environment on top of Windows.