[root@localhost mongodb]# ./bin/mongoexport --help Export MongoDB data to CSV, TSV or JSON files. options:  --help          produce help message  -v [ --verbose ]     be more verbose (include multiple times for more                verbosity e.g. -vvvvv)  --version         print the program's version and exit  -h [ --host ] arg     mongo host to connect to ( <set name>/s1,s2 for                sets)  --port arg        server port. Can also use --host hostname:port  --ipv6          enable IPv6 support (disabled by default)  -u [ --username ] arg   username  -p [ --password ] arg   password  --dbpath arg       directly access mongod database files in the given                path, instead of connecting to a mongod server -                needs to lock the data directory, so cannot be used               if a mongod is currently accessing the same path  --directoryperdb     if dbpath specified, each db is in a separate                directory  --journal         enable journaling  -d [ --db ] arg      database to use  -c [ --collection ] arg  collection to use (some commands)  -f [ --fields ] arg    comma separated list of field names e.g. -f                name,age  --fieldFile arg      file with fields names - 1 per line  -q [ --query ] arg    query filter, as a JSON string  --csv           export to csv instead of json  -o [ --out ] arg     output file; if not specified, stdout is used  --jsonArray        output to a json array rather than one object per                line  -k [ --slaveOk ] arg (=1) use secondaries for export if available, default                true 

 [root@localhost mongodb]# ./bin/mongoimport --help options:  --help         produce help message  -v [ --verbose ]    be more verbose (include multiple times for more               verbosity e.g. -vvvvv)  --version        print the program's version and exit  -h [ --host ] arg    mongo host to connect to ( <set name>/s1,s2 for sets)  --port arg       server port. Can also use --host hostname:port  --ipv6         enable IPv6 support (disabled by default)  -u [ --username ] arg  username  -p [ --password ] arg  password  --dbpath arg      directly access mongod database files in the given               path, instead of connecting to a mongod server -               needs to lock the data directory, so cannot be used               if a mongod is currently accessing the same path  --directoryperdb    if dbpath specified, each db is in a separate               directory  --journal        enable journaling  -d [ --db ] arg     database to use  -c [ --collection ] arg collection to use (some commands)  -f [ --fields ] arg   comma separated list of field names e.g. -f name,age  --fieldFile arg     file with fields names - 1 per line  --ignoreBlanks     if given, empty fields in csv and tsv will be ignored  --type arg       type of file to import. default: json (json,csv,tsv)  --file arg       file to import from; if not specified stdin is used  --drop         drop collection first   --headerline      CSV,TSV only - use first line as headers  --upsert        insert or update objects that already exist  --upsertFields arg   comma-separated fields for the query part of the               upsert. You should make sure this is indexed  --stopOnError      stop importing at first error rather than continuing  --jsonArray       load a json array, not one item per line. Currently               limited to 4MB.