Exit existing SSH #ControlMaster and reconnect
bit@goyun.info:/tmp $ ssh -O check u.goyun.info
Master running (pid=2252)
bit@goyun.info:/tmp $ ssh -O exit u.goyun.info
Exit request sent.
bit@goyun.info:/tmp $ ssh u.goyun.info
MongoDB stores documents in collections
Collections are analogous to tables in relational databases. If a collection does not exist, MongoDB creates the collection when you first store data for that collection.
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