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A prompt for the mongo shell that displays the user you're logged in as and the database you're pointed at.
Set the mongo shell prompt to display [user name]@[database name]. If the user or database name cannot
be captured, then display "<none>" instead.
var prompt = function() {
var user = db.runCommand({connectionStatus : 1}).authInfo.authenticatedUsers[0].user || "<none>";
var dbLabel = db.getName() || "<none>";
return user + "@" + dbLabel + ">";
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