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dual-spaces-imac:~ dual$ sudo port selfupdate
Password:

MacPorts base version 1.600 installed

Downloaded MacPorts base version 1.600

The MacPorts installation is not outdated and so was not updated
selfupdate done!

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dual-spaces-imac:~ dual$ sudo port -u upgrade outdated
Can't map the URL 'file://.' to a port description file ("Could not find Portfile in /Users/dual").
Please verify that the directory and portfile syntax are correct.
To use the current port, you must be in a port's directory.
(you might also see this message if a pseudo-port such as
outdated or installed expands to no ports).
Error: No port  found.