# mongorestore -uuser -ppass --host 127.0.0.1 -d test /var/backups/mongodb/.tmp/test
connected to: 127.0.0.1
assertion: 18 { code: 18, ok: 0.0, errmsg: "auth fails" }

# mongo --version
MongoDB shell version: 2.4.3

# mongorestore -uuser -ppass --host 127.0.0.1 -d test /var/backups/mongodb/.tmp/2013-06-21_18-15-51/test
connected to: 127.0.0.1
Fri Jun 21 18:16:14 /var/backups/mongodb/.tmp/2013-06-21_18-15-51/test/testData.bson
Fri Jun 21 18:16:14     going into namespace [test.testData]
Fri Jun 21 18:16:14 warning: Restoring to test.testData without dropping. Restored data will be inserted without raising errors; check your server log
2 objects found
Fri Jun 21 18:16:14     Creating index: { key: { _id: 1 }, ns: "test.testData", name: "_id_" }

# mongo --version
MongoDB shell version: 2.2.2