Please note: a manpage is currently not part of the Mac OS X distribution.
The directory /usr/bin is usually
not shown in the Finder. To open it, use the Finder menu item
> Go to folder.
If you like to, you can even switch all invisible files and folders visible in the Finder. To make them visible in the Finder, run the Terminal app (Applications > Utilities > Terminal) and enter the following line:
defaults write com.apple.finder AppleShowAllFiles TRUE
You have to restart the Finder to activate this change.