$ mongoexport -c test -d test --fields x
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connected to: 127.0.0.1
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{ "_id" : { "$oid" : "5237218d6b8872341646d85f" }, "x" : 1 }
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{ "_id" : { "$oid" : "5237218e6b8872341646d860" }, "x" : 1 }
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{ "_id" : { "$oid" : "523721916b8872341646d861" }, "x" : 1 }
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{ "_id" : { "$oid" : "523721966b8872341646d862" }, "x" : 2 }
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{ "_id" : { "$oid" : "523721976b8872341646d863" }, "x" : 2 }
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exported 5 records
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$ cat fields.txt
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x
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$ mongoexport -c test -d test --fieldFile fields.txt
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connected to: 127.0.0.1
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{ "_id" : { "$oid" : "5237218d6b8872341646d85f" }, "x" : 1, "y" : 1 }
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{ "_id" : { "$oid" : "5237218e6b8872341646d860" }, "x" : 1, "y" : 1 }
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{ "_id" : { "$oid" : "523721916b8872341646d861" }, "x" : 1, "y" : 2 }
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{ "_id" : { "$oid" : "523721966b8872341646d862" }, "x" : 2, "y" : 2 }
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{ "_id" : { "$oid" : "523721976b8872341646d863" }, "x" : 2, "y" : 1 }
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exported 5 records
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$
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