port upgrade outdated

[Michael Stevens]

Hi.

Is 'port upgrade outdated' the wrong command to upgrade all my obsolete 
ports? It gives:

 > sudo port upgrade outdated
Can't map the URL 'file://.' to a port description file (Could not find 
Portfile in .). Please verify that the directory and portfile syntax are 
correct.
Error: To use the current port, you must be in a port's directory
Error: No port  found.

The man page looks like it should work.

Michael