I would like to set up a cron job that recusively does a chmod/chown on a directory (the dropbox directory).

This works when I execute the commands manually like:

```
sudo chown -R $USER ~/Dropbox
sudo chmod -R u+rw ~/Dropbox

```

I tried to convert it into a cron job like this:

```
10      *       *       *       *       sudo chown -R $USER ~/Dropbox

```

But it doesn't seem to do the job.

How to do this?