Show a macOS notification when a terminal task is done

.bashrc

# Name it whatever you want. I like `y` because in my keyboard layout it's close to `;`
function y() {
    previous=$?
    if [ $previous -eq 0 ]; then
        osascript -e "display notification \"Done\" with title \"Terminal Task\"" && say "it is done";
    else
        osascript -e "display notification \"Failed\" with title \"Terminal Task\"" && say "it went to the trees";
    fi
}

example

npm test ;y

For fish see: https://github.com/fisherman/done