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General Parameters
--help prints help
--version prints version
--number NUM number of documents
--stdout prints output to stdout

Database Parameters
--host HOST host to connect to
--port PORT port to connect to
--database D database to insert
--collection C collection to insert
--drop drops collection before
--write-concern W write concern

Operators
$objectid random ObjectId
$number random integer
$datetime random date/time
$missing field is missing
$choose picks one from selection
$array array of elements