[gentoo-user] Gentoo equivalent to "yum provides"

[Rennie deGraaf <degraaf@cpsc.ucalgary.ca>]

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What command does one use to find what package(s) provide a particular
file, given that that particular file is not present on my system? For
example, I need a program called "foobar", but don't know what package
provides it. Under Fedora, I'd use "yum provides foobar"; what command
should I use under Gentoo?

Something like "esearch foobar" searches package titles, not contents.
So, if I was searching for "vi", I'd get all sorts of stuff that has
nothing to do with the editor "vi", but happens to have the substring
"vi" in its name.  And if I was searching for "libfoobar.so", then I
might not find any matches, since that file might be in a package called
"foobar".  In other words, "esearch foobar" doesn't do what I want.

Thanks,

Rennie
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