I made a management app imaginitively called `update`. The following work fine from the command line:

```
./manage.py update
/full/path/manage.py update

```

But when I have the following cron command:

```
00 */3 * * * /websites/bnc/manage.py update >/dev/null

```

It emails me this error:

> 
> Unknown command: 'update'
> 
> 
> Type 'manage.py help' for usage.
> 
> 
> 

It smells like a path issue but I can't see how because I can call it manually from wherever. Any idea what's going on here?