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Argh what OS are we dealing with?
so old sh syntax:
EDITOR=/usr/bin/vi (or wherever it is)
HISTFILE=$HOME/.sh_history
export EDITOR HISTFILE

export EDITOR=vi
...

But do you have a history file? HISTFILE
standard would be HISTFILE=~HOME/.sh_history

depends of your shell and OS...
HPUX with ksh and set -o vi, Esc Esc
AIX with ksh and set -o vi , Esc \ (backslash)
etc...