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KornShell, also written as ksh or just plain 'k', is a Unix shell that was developed by David Korn at AT&T Bell Laboratories in the early 1980s. It combines the best features of its predecessors — the C Shell (csh) and the Bourne Shell (sh) — into an interactive script language with high-level programming constructs for writing shell scripts. The language has many advanced features found in programming languages like variables types, compound variables, built-in arithmetic operations and control structures such as if-then-else clauses and while loops. KornShell's syntactical structure is designed to make common tasks simpler, have improved performance over other shells at that time, and be more powerful in terms of scripting capabilities. The KornShell became part of the Unix standard through POSIX standards in 2008 (POSIX:2013).

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