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How to find a package name by a command name?

Sorry to ask such a simple question, but I wonder if there is any listing or any site that I can easily find the package for a command. For instance I want to use '\includegraphics{}' but I don't know how to find the appropriate package to use. This question applies in the other way as well. If I want to know what are the functions inside a package.

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marked as duplicate by Matthew Leingang, lockstep, Hendrik Vogt, Stefan Kottwitz Dec 8 '10 at 15:27

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

I'd like to know the answer to this one too. Googling does not seem to work too well, because most documentation is hidden away in attached pdf files. – donatello Dec 8 '10 at 10:57
This question was asked (and answered) in this post (possible duplicate). – Hendrik Vogt Dec 8 '10 at 10:59
you don't need a package to use \mathcal: it just needs to be inside mathmode: $\mathcal{X}$ works fine without any packages... – Seamus Dec 8 '10 at 11:05
I have written 'for example'. :D Ok I edit it to something more real. – Yasser Sobhdel Dec 8 '10 at 11:14
This is difficult, I agree. Google was my friend, but the TeX world is big and finding the right way to do things can be very difficult. – Lennart Regebro Dec 8 '10 at 11:14
up vote 1 down vote accepted

If I'm running into such problems, the commands are mostly very exotic (not like includegraphics). I use the CTAN network package search to find a overview of packages which are delivering the desired macro. It's faster than google but not perfect :) I use the third text box on the linked site.

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