File: histexp4.sub

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bash 5.0-4
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HISTFILE=$TMPDIR/bashhist-$$

set -o history
set -o histexpand

echo a
cat < <(echo !!)

echo b
echo !! `echo !!`

echo c
echo "$(echo "!" )"

echo d
echo "$(echo '!' )"

echo e
echo '!' "!"
echo "'!'"

set +o history
rm -f $HISTFILE