Editing KornShell (section)

==Features==
KornShell complies with [[POSIX#POSIX.2|POSIX.2]], Shell and Utilities, Command Interpreter (IEEE Std 1003.2-1992.)  Major differences between KornShell and the traditional Bourne shell include:
* [[Job control (Unix)|job control]], [[alias (command)|command aliasing]], and [[command history]] designed after the corresponding [[C shell]] features; job control was added to the Bourne Shell in 1989<ref>{{cite web|url=https://www.in-ulm.de/~mascheck/bourne/|title=traditional Bourne shell family / history and development|website=In-ulm.de|access-date=10 December 2018}}</ref>
* a choice of three command line editing styles based on [[Vi (text editor)|vi]], [[Emacs]], and [[Gosling Emacs]]
* [[associative array]]s and built-in [[floating-point arithmetic]] operations (only available in the {{mono|ksh93}} version of KornShell)
* dynamic search for functions
* mathematical functions
* process substitution and process redirection
* C-language-like expressions
* enhanced expression-oriented {{mono|for}} and {{mono|while}} loops
* dynamic extensibility of (dynamically loaded) built-in commands (since {{mono|ksh93}})
* reference variables
* hierarchically nested variables
* variables can have member functions associated with them
* object-oriented-programming (since {{mono|ksh93t}})
** variables can be objects with member (sub-)variables and member methods
** object methods are called with the object variable name followed (after a dot character) by the method name
** special object methods are called on: object initialization or assignment, object abandonment ({{mono|unset}})
** composition and aggregation is available, as well as a form of inheritance