list not upgraded packages

[T o n g <mlist4suntong@yahoo.com>]

Hi, 

I was able to see a list of not upgraded packages, but not now:

% aptitude upgrade
Resolving dependencies...
No packages will be installed, upgraded, or removed.
0 packages upgraded, 0 newly installed, 0 to remove and 9 not upgraded.
Need to get 0B of archives. After unpacking 0B will be used.
Writing extended state information... Done
Reading package lists... Done             
Building dependency tree       
Reading state information... Done
Reading extended state information... Done
Initializing package states... Done       

How can I know which packages are not upgraded?

Thanks

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