Mongodb Backup Reported Error too many positional options

  mongodb, question

The purpose is to back up all the data of the whole project, not limited to one collection.

Commands Used:
mongoexport —db Demo —out demo_backup.json

Error reporting after operation:
Error parsing command line: too many positional options

Please help the great gods

I solved this problem by removing the spaces between the fields to be exported after the -f parameter. Then it will be all right.