How to get a vi like editor during STDIN

[Harry Putnam]

I'm wondering how one could arrange to have a vi like editor to use
during <STDIN>, something like is available in Ksh88 and ksh93, but
not pdksh.

Where during stdin to program one can have vi like commands available
for editing the input.

Example can be seen by invoking ksh (88 or 93) like:

ksh read line

During input, vi like editing is possible.



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