(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].