1ksh93u+ is the 2012-08-01 (stable) version of the KornShell Language
2described in "The KornShell Command and Programming Language," by
3Morris Bolsky and David Korn of AT&T Bell Laboratories.  The KornShell
4is a shell programming language, which is upward compatible with "sh"
5(the Bourne Shell), and is intended to conform to the IEEE P1003.2/ISO
69945.2 Shell and Utilities standard.  ksh93u+ provides an enhanced
7programming environment in addition to the major command-entry
8features of the BSD shell "csh".  With ksh93u+, medium-sized programming
9tasks can be performed at shell-level without a significant loss
10in performance.  In addition, "sh" scripts can be run on ksh93u+
11without modification.
12