The es shell is a command line interpreter developed by Byron Rakitzis and Paul Haahr, that uses a scripting language similar to the rc shell of the Plan 9 operating system. It is intended to provide a fully functional programming language as a Unix shell. The bulk of es' development occurred in the early 1990s. A paper on an early version of the es shell was presented at the Winter 1993 USENIX conference in San Diego. A patched version of which includes job control features, a precompiled binary, additional documentation, a basic emacs editing mode and other contributed programs is available: The Xs shell is a fork of es with bugfixes, code cleanup, better readline integration and syntax improvements. Kes is a fork of es compatible with Linux and Mac OS X.
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