Linux API's

[MiKuS]

most of you should know of MSDN which is a pretty good site if you're developing for a windows box, but what about linux? is there some sort of way i can search through API's?

[unbuntu]

http://www.gnu.org/software/libc/manual/html_node/index.html#Top
May not be as extensive as MSDN but it should get your way around GNU/C, which is what I suppose what you mean by Linux API

[MiKuS]

cheers, any other links worth looking at?