< operating system > (es) A Unix shell written by Byron Rakitzis byron@netapp.com and Paul Haahr haahr@adobe.com , derived from rc . Es has real functions , closures , exceptions and lets you redefine most internal shell operations.
Version: 0.84.
ftp://ftp.sys.utoronto.ca/pub/es/ .
["Es - A Shell with Higher Order Functions", P. Haahr et al, Proc Winter 1993 Usenix Technical Conference].
(1993-04-30)