```
res=$(osascript -e 'tell application "System Events" to get name of application processes whose frontmost is true and visible is true');
if [ $res == "Kim" ]
then
    osascript -e 'tell application "System Events" to set visible of process "Kim" to false'"
else
    open -a 'Kim.app'
fi
```

I did it like this, it works but excutes very slow, how to optimize this?