[gentoo-dev] how to determine if a virtual is installed, from the shell?

[Owen Gunden]

So hypothetically, if I wanted to write a shell script that behaved
differently if virtual/mta was installed than if it was not, what would I
do?

I'd like a command that would return a specific exit status based on
whether or not the virtual dependency is there.  But frankly I'm willing to
use grep for a nice gross hack too.  Tell the truth, I don't even know how
to do this for regular (non-virtual) packages.

I've played around with qpkg, but with little luck.  Is there any way to do
this with or without qpkg?

TIA,
Owen

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