There is mistake in your syntax.
From mongo version 3.0.0, mongoexport removed the --type = csv option. Use the --type=csv option to specify CSV format for the output.
You should use :
mongoexport --db tests --collection accounts --type=csv --fields account_number,situses --out coordinates.csv
For nested fields you should use :
mongoexport --db tests --collection accounts --csv --fields 'account_number,situses.0.coordinates' --out /home/vishwas/c1.csv
EDIT for mongo 3.0 with sub documents:
You need to create separate collection with required fields from subdocuments like -
db.test.aggregate({"$unwind":"$situses"},{"$project":{"_id":0,"account_number":1,"siteUsesCo":"$situses.coordinates"}},{"$out" : "forcsv"})
If you want only one field from subdocument then use aggregation like -
db.test.aggregate({"$unwind":"$situses"},{"$limit":1},{"$project":{"_id":0,"account_number":1,"siteUsesCo":"$situses.coordinates"}},{"$out" : "forcsv"})
And then export from forcsv
collection like-
mongoexport --db test --collection forcsv --csv --fields 'account_number,siteUsesCo' --out coordinates.csv
And after exporting delete collection forcsv
.
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