I hope this is the right forum for this, and excuse the naive question.

I would like to provide an "guest" login to a (non-dedicated) linux server and run just one console application. The user cannot do anything more than use this application. A scenario could be:

```
      ssh dervinATsomehost.com (no password)

```

and the just automatically execute the shell app, say

```
       Welcome to Dervin's shell.
       Dervin$

```

when the user says exit, the whole connection would drop, not just the application.

This seems relatively simple, but I wouldn't know where to start.

Thanks.

[**NOTE** I've posted this on Serverfault also. Did not know which forum was the best. Feel free to close if it's not pertinent.]