$mongo admin --eval "db.shutdownServer()"
MongoDB shell version: 2.6.4
connecting to: admin
2015-02-19T10:54:22.574+0200 DBClientCursor::init call() failed
server should be down...
It's returning some odd messages, but it works.
And I have made alias-command for running it easy.
alias stop-mongo='/opt/mongo/release/bin/mongo admin --eval "db.shutdownServer()"'
This works at least if you start your mongo manually (e.g. with --fork option).