[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.