In order to install/upgrade the "rsync" package, one needs to fully specify the package name: "emerge net-misc/rsync", because otherwise portage synchronises its portage tree with the rsync server (a la "emerge sync"). Since, as far as I can tell, most people use "emerge sync" when they want to do this, and it's more intuitive, and more general (if we switch to CVS, for example, and it is what is used in "emerge --help", and in the installation manual, would it not be a Good Thing (tm) if we lost the "rsync" alias to "sync"?
*** This bug has been marked as a duplicate of 2365 ***