mongodump的官方說明：
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 ( /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)
 -o [ --out ] arg (=dump) output directory or "-" for stdout
 -q [ --query ] arg json query
 --oplog Use oplog for point-in-time snapshotting
 --repair try to recover a crashed database
 --forceTableScan force a table scan (do not use $snapshot)

mongorestore的官方說明(可通過mongorestore --help查看)：
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 ( /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)
 --objcheck validate object before inserting
 --filter arg filter to apply before inserting
 --drop drop each collection before import
 --oplogReplay replay oplog for point-in-time restore
 --oplogLimit arg exclude oplog entries newer than provided timestamp
 (epoch[:ordinal])
 --keepIndexVersion don't upgrade indexes to newest version
 --noOptionsRestore don't restore collection options
 --noIndexRestore don't restore indexes
 --w arg (=1) minimum number of replicas per write

mongoexport的官方說明(可通過mongoexport --help查看)：
 --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 ( /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
 --forceTableScan force a table scan (do not use $snapshot)

mongoimport的官方說明(可通過mongoimport --help查看)：
 --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 ( /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 16MB.