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(via GIGO)
While rc was an experiment in adding modern syntax to Bourne shell semantics, es is an exploration of new semantics combined with rc-influenced syntax: es has lexically scoped variables, first-class functions, and an exception mechanism, which are concepts borrowed from modern programming languages such as Scheme and ML.
I never heard of anyone using this shell, but it sounds cool. The paper is quite readable and describes many interesting details (including garbage collection and a discussion of the implementation).
The es version described in the paper is not properly tail recursive (I am not sure about the current version).
Now, a shell that would provide call/cc would be reallly interesting...
Posted to functional by Ehud Lamm on 12/27/02; 2:40:19 PM
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Es: A shell with higher-order functions
