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The ~v flag will display all virtual packages, but even if they are already provided by installed packages, adding ~i will make the list empty as virtual packages can never have i flag. So how do I find out what virtuals are installed?

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So you want the virtual packages (?virtual) that are provided by (?reverse-provides()) an installed package (?installed). That's

?virtual ?reverse-provides(?installed)

or ~v ~Rprovides:~i for short.

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Thanks! I've tried so many combinations, even using to ?for but still couldn't figure out why they don't work. Then I realized ?for doesn't return a different package; it only applies filter with the condition given. – syockit Jun 3 '11 at 13:18

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