[gentoo-dev] Tips/Tricks to avoid repetitively running 'emerge --pretend'?

[Ibraheem Umaru-Mohammed <iumarumohammed@gmail.com>]

Hi, 

Is there a better way to get a picture of the dependency tree that
emerge walks? For example, when one wishes to unmask a package, it is
possible that that package is itself dependent on other packages that
require unmasking, and so on and so on. 

It's a little annoying having to: 
    emerge -uDp world 
then 
    echo foo-bar/baz >> /etc/portage/package.unmask 
then 
    emerge -uDp world 
then 
    echo qux-quux/corge >> /etc/portage/package.unmask 

Until all dependencies have been met. 

Are there any tricks or tips on how best to do this time-saving wise?
Could the results be somehow cached so that subsequent runs are quicker?
Or could the dependency tree be viewed somehow, so that the list of
packages to unmask could be done in one step? 

Regards, 

            --ibz.

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