$> [[ "$(echo)" == "$(echo '')" ]] && echo $? || echo $? $> 0 Trivial note. `; echo $?` instead of `&& echo $? || echo $?` $> [[ "$(echo)" == "$(echo '')"

$> [[ "$(echo)" == "$(echo '')" ]] && echo $? || echo $? $> 0 Trivial note. `; echo $?` instead of `&& echo $? || echo $?` $> [[ "$(echo)" == "$(echo '')" ]]; echo $? $> 0