What is 'expect'

[Wm Randolph Franklin]

The interactive shell 'expect' looks useful according to the long shell
summary.  What is it and where would I get it?  Thanks.
-- 
						   Wm. Randolph Franklin
Internet: wrf at ecse.rpi.edu (or @cs.rpi.edu)    Bitnet: Wrfrankl at Rpitsmts
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Paper: ECSE Dept., 6026 JEC, Rensselaer Polytechnic Inst, Troy NY, 12180