LC_ALL=C
LANG=C

set -o history
set -H

echo '!'
echo "!"
echo !

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

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

echo "$( echo "\!" )"
echo "\!"

echo "$( echo '\!' )"
echo '\!'