es (extensible shell)[1] is a command line interpreter developed by Byron Rakitzis and Paul Haahr, that uses a scripting language syntactically similar to the rc shell of the Plan 9 operating system[2] and was originally based on code from Byron Rakitzis's clone of rc for Unix.[3] It is intended to provide a fully functional programming language as a Unix shell.[4] The bulk of es development occurred in the early 1990s, after the shell was introduced at the Winter 1993 USENIX conference in San Diego.[5]
Official releases appear to have ceased after 0.9-beta1 in 1997,[6] and standard es lacks some features compared to more popular shells such as zsh and bash,[7] but unofficial development has been continued with job control and history patches and a more ambitious renamed fork, Xs (including syntax changes and C++ code).
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