umbramei

The 'help' command is exactly what you're looking for -- e.g., 'help disown' will describe the 'disown' command. Definitely beats searching the entire bash man page for the command you want (which is what I did for far too long, until I found out about 'help').

For those that didn't read through the entire linked page, there is also an Eclim client for Emacs under active development (https://github.com/senny/emacs-eclim). I don't know that it's quite as feature-rich as the Vim version, and it's certainly less well-documented, but it does add some nifty IDE features to Emacs without forcing you to do your development inside Eclipse itself.

They're shell built-ins, so use "man bash" to read about them.