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For interactive use, ksh provides the ability to edit the command line in a WYSIWYG fashion, by hitting the cursor-up or previous-line or the ! key to recall a previous command, and then edit the command as if the users were in edit line mode. It was patterned after the ed editor, the basis for the vi editor, with an influence on command-line editing in the emacs editor versions.
It also includes built-in arithmetic evaluation and advanced scripting functions similar to those used in more powerful programming languages such as awk, sed, and perl.
ksh aims to respect the Shell Language Standard ( POSIX 1003.2 "Shell and Utilities Language Committee").
The KornShell is sold by AT&T and Novell and by other companies abroad -- both source and binary.
SKsh is an AmigaDOS version, that offers several Amiga-specific features such as ARexx interoperability.
pdksh is a public domain implementation for UnixUNIX (or Unix is a portable, multi-task and multi-user computer operating system originally developed by a group of AT&T Bell Labs employees including Ken Thompson, Dennis Ritchie and Douglas McIlroy. Unices The term Unices includes Unix and Unix-like ope.