db.help()
DB methods:
    db.adminCommand(nameOrDocument)　　 　　　　　　- switches to 'admin' db, and runs command [ just calls db.runCommand(...) ]
    db.auth(username, password)
    db.cloneDatabase(fromhost)
    db.commandHelp(name)　　　　　　　　　　　　　　　- returns the help for the command
    db.copyDatabase(fromdb, todb, fromhost)
    db.createCollection(name, { size : ..., capped : ..., max : ... } )
    db.createUser(userDocument)
    db.currentOp() 　　　　　　　　　　　　　　　　　　- displays currently executing operations in the db
    db.dropDatabase()
    db.eval(func, args)　　　　　　　　　　　　　　　 - run code server-side
    db.fsyncLock() 　　　　　　　　　　　　　　　　　　- flush data to disk and lock server for backups
    db.fsyncUnlock() 　　　　　　　　　　　　　　　　 - unlocks server following a db.fsyncLock()
    db.getCollection(cname) 　　　　　　　　　　　　 - same as db['cname'] or db.cname
    db.getCollectionInfos()
    db.getCollectionNames()
    db.getLastError() 　　　　　　　　　　　　　　　　- just returns the err msg string
    db.getLastErrorObj() 　　　　　　　　　　　　　　- return full status object
    db.getMongo()　　　　　　　　　　　　　　　　　　  - get the server connection object
    db.getMongo().setSlaveOk()　　　　　　　　　　　- allow queries on a replication slave server
    db.getName()
    db.getPrevError()
    db.getProfilingLevel() 　　　　　　　　　　　　 - deprecated
    db.getProfilingStatus() 　　　　　　　　　　　　- returns if profiling is on and slow threshold
    db.getReplicationInfo()
    db.getSiblingDB(name) 　　　　　　　　　　　　　- get the db at the same server as this one
    db.getWriteConcern() 　　　　- returns the write concern used for any operations on this db, inherited from server object if set
    db.hostInfo() 　　　　　　　　　　　　　　　　　　- get details about the server's host
    db.isMaster() 　　　　　　　　　　　　　　　　　　- check replica primary status
    db.killOp(opid)　　　　　　　　　　　　　　　　  - kills the current operation in the db
    db.listCommands() 　　　　　　　　　　　　　　　 - lists all the db commands
    db.loadServerScripts() 　　　　　　　　　　　　 - loads all the scripts in db.system.js
    db.logout()
    db.printCollectionStats()
    db.printReplicationInfo()
    db.printShardingStatus()
    db.printSlaveReplicationInfo()
    db.dropUser(username)
    db.repairDatabase()
    db.resetError()
    db.runCommand(cmdObj) 　　　　　　　　　　　　　   - run a database command.  }
    db.serverStatus()
    db.setProfilingLevel(level,<slowms>)           - =off =slow =all
    db.setWriteConcern( <write concern doc> )　　　 - sets the write concern for writes to the db
    db.unsetWriteConcern( <write concern doc> )    - unsets the write concern for writes to the db
    db.setVerboseShell(flag)                       - display extra information in shell output
    db.shutdownServer()
    db.stats()
    db.version() 　　　　　　　　　　　　　　　　　　　　- current version of the server

function () {
    var shortName = this.getName();
    print("DBCollection help");
    print("\tdb." + shortName + ".find().help() - show DBCursor help");
    print("\tdb." + shortName + ".count()");
    print("\tdb." + shortName + ".copyTo(newColl) - duplicates collection by copying all documents to newColl; no indexes are copied.");
    print("\tdb." + shortName + ".convertToCapped(maxBytes) - calls {convertToCapped:'" + shortName + "', size:maxBytes}} command");
    print("\tdb." + shortName + ".dataSize()");
    print("\tdb." + shortName + ".distinct( key ) - e.g. db." + shortName + ".distinct( 'x' )");
    print("\tdb." + shortName + ".drop() drop the collection");
    print("\tdb." + shortName + ".dropIndex(index) - e.g. db." + shortName + ".dropIndex( \"indexName\" ) or db." + shortName + ".dropIndex( { \"indexKey\" : 1 } )");
    print("\tdb." + shortName + ".dropIndexes()");
    print("\tdb." + shortName + ".ensureIndex(keypattern[,options]) - options is an object with these possible fields: name, unique, dropDups");
    print("\tdb." + shortName + ".reIndex()");
    print("\tdb." + shortName + ".find([query],[fields]) - query is an optional query filter. fields is optional set of fields to return.");
    print("\tdb." + shortName + ".find( {x:77} , {name:1, x:1} )");
    print("\tdb." + shortName + ".find(...).count()");
    print("\tdb." + shortName + ".find(...).limit(n)");
    print("\tdb." + shortName + ".find(...).skip(n)");
    print("\tdb." + shortName + ".find(...).sort(...)");
    print("\tdb." + shortName + ".findOne([query])");
    print("\tdb." + shortName + ".findAndModify( { update : ... , remove : bool [, query: {}, sort: {}, 'new': false] } )");
    print("\tdb." + shortName + ".getDB() get DB object associated with collection");
    print("\tdb." + shortName + ".getPlanCache() get query plan cache associated with collection");
    print("\tdb." + shortName + ".getIndexes()");
    print("\tdb." + shortName + ".group( { key : ..., initial: ..., reduce : ...[, cond: ...] } )");
    print("\tdb." + shortName + ".insert(obj)");
    print("\tdb." + shortName + ".mapReduce( mapFunction , reduceFunction , <optional params> )");
    print("\tdb." + shortName + ".aggregate( [pipeline], <optional params> ) - performs an aggregation on a collection; returns a cursor");
    print("\tdb." + shortName + ".remove(query)");
    print("\tdb." + shortName + ".renameCollection( newName , <dropTarget> ) renames the collection.");
    print("\tdb." + shortName + ".runCommand( name , <options> ) runs a db command with the given name where the first param is the collection name");
    print("\tdb." + shortName + ".save(obj)");
    print("\tdb." + shortName + ".stats()");
    print("\tdb." + shortName + ".storageSize() - includes free space allocated to this collection");
    print("\tdb." + shortName + ".totalIndexSize() - size in bytes of all the indexes");
    print("\tdb." + shortName + ".totalSize() - storage allocated for all data and indexes");
    print("\tdb." + shortName + ".update(query, object[, upsert_bool, multi_bool]) - instead of two flags, you can pass an object with fields: upsert, multi");
    print("\tdb." + shortName + ".validate( <full> ) - SLOW");;
    print("\tdb." + shortName + ".getShardVersion() - only for use with sharding");
    print("\tdb." + shortName + ".getShardDistribution() - prints statistics about data distribution in the cluster");
    print("\tdb." + shortName + ".getSplitKeysForChunks( <maxChunkSize> ) - calculates split points over all chunks and returns splitter function");
    print("\tdb." + shortName + ".getWriteConcern() - returns the write concern used for any operations on this collection, inherited from server/db if set");
    print("\tdb." + shortName + ".setWriteConcern( <write concern doc> ) - sets the write concern for writes to the collection");
    print("\tdb." + shortName + ".unsetWriteConcern( <write concern doc> ) - unsets the write concern for writes to the collection");
    return __magicNoPrint;
}

function () {
    print( "\tsh.addShard( host )                       server:port OR setname/server:port" )
    print( "\tsh.enableSharding(dbname)                 enables sharding on the database dbname" )
    print( "\tsh.shardCollection(fullName,key,unique)   shards the collection" );

    print( "\tsh.splitFind(fullName,find)               splits the chunk that find is in at the median" );
    print( "\tsh.splitAt(fullName,middle)               splits the chunk that middle is in at middle" );
    print( "\tsh.moveChunk(fullName,find,to)            move the chunk where 'find' is to 'to' (name of shard)");

    print( "\tsh.setBalancerState( <bool on or not> )   turns the balancer on or off true=on, false=off" );
    print( "\tsh.getBalancerState()                     return true if enabled" );
    print( "\tsh.isBalancerRunning()                    return true if the balancer has work in progress on any mongos" );

    print( "\tsh.addShardTag(shard,tag)                 adds the tag to the shard" );
    print( "\tsh.removeShardTag(shard,tag)              removes the tag from the shard" );
    print( "\tsh.addTagRange(fullName,min,max,tag)      tags the specified range of the given collection" );

    print( "\tsh.status()                               prints a general overview of the cluster" )
}

function () {
    print("\trs.status()                     { replSetGetStatus : 1 } checks repl set status");
    print("\trs.initiate()                   { replSetInitiate : null } initiates set with default settings");
    print("\trs.initiate(cfg)                { replSetInitiate : cfg } initiates set with configuration cfg");
    print("\trs.conf()                       get the current configuration object from local.system.replset");
    print("\trs.reconfig(cfg)                updates the configuration of a running replica set with cfg (disconnects)");
    print("\trs.add(hostportstr)             add a new member to the set with default attributes (disconnects)");
    print("\trs.add(membercfgobj)            add a new member to the set with extra attributes (disconnects)");
    print("\trs.addArb(hostportstr)          add a new member which is arbiterOnly:true (disconnects)");
    print("\trs.stepDown([secs])             step down as primary (momentarily) (disconnects)");
    print("\trs.syncFrom(hostportstr)        make a secondary to sync from the given member");
    print("\trs.freeze(secs)                 make a node ineligible to become primary for the time specified");
    print("\trs.remove(hostportstr)          remove a host from the replica set (disconnects)");
    print("\trs.slaveOk()                    shorthand for db.getMongo().setSlaveOk()");
    print("\trs.printReplicationInfo()       check oplog size and time range");
    print("\trs.printSlaveReplicationInfo()  check replica set members and replication lag");
    print("\tdb.isMaster()                   check who is primary");
    print("\treconfiguration helpers disconnect from the database so the shell will display");
    print("\tan error, even if the command succeeds.");
    print("\tsee also http://<mongod_host>:28017/_replSet for additional diagnostic info");
}