ksh - 93u+20120801-3.4+deb10u1 main

Ksh is a UNIX command interpreter (shell) that is intended for both
interactive and shell script use. Its command language is a superset of
the sh(1) shell language.
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The 1993 version adds a number of new, mostly scripting related,
features over the 1988 version that is typically distributed with
commercial UNIX variants. For example, it has lexical scoping, compound
variables, associative arrays, named references and floating point
math.
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The shcomp tool can be used to compile ksh scripts into a binary format.