.explain() should be included in the shell's DBCollection help

> db.coll.help()

DBCollection help

	db.coll.find().help() - show DBCursor help

	db.coll.count()

	db.coll.copyTo(newColl) - duplicates collection by copying all documents to newColl; no indexes are copied.

	db.coll.convertToCapped(maxBytes) - calls {convertToCapped:'coll', size:maxBytes}} command

	db.coll.dataSize()

	db.coll.distinct( key ) - e.g. db.coll.distinct( 'x' )

	db.coll.drop() drop the collection

	db.coll.dropIndex(index) - e.g. db.coll.dropIndex( "indexName" ) or db.coll.dropIndex( { "indexKey" : 1 } )

	db.coll.dropIndexes()

	db.coll.ensureIndex(keypattern[,options])

	db.coll.reIndex()

	db.coll.find([query],[fields]) - query is an optional query filter. fields is optional set of fields to return.

	                                              e.g. db.coll.find( {x:77} , {name:1, x:1} )

	db.coll.find(...).count()

	db.coll.find(...).limit(n)

	db.coll.find(...).skip(n)

	db.coll.find(...).sort(...)

	db.coll.findOne([query])

	db.coll.findAndModify( { update : ... , remove : bool [, query: {}, sort: {}, 'new': false] } )

	db.coll.getDB() get DB object associated with collection

	db.coll.getPlanCache() get query plan cache associated with collection

	db.coll.getIndexes()

	db.coll.group( { key : ..., initial: ..., reduce : ...[, cond: ...] } )

	db.coll.insert(obj)

	db.coll.mapReduce( mapFunction , reduceFunction , <optional params> )

	db.coll.aggregate( [pipeline], <optional params> ) - performs an aggregation on a collection; returns a cursor

	db.coll.remove(query)

	db.coll.renameCollection( newName , <dropTarget> ) renames the collection.

	db.coll.runCommand( name , <options> ) runs a db command with the given name where the first param is the collection name

	db.coll.save(obj)

	db.coll.stats({scale: N, indexDetails: true/false, indexDetailsKey: <index key>, indexDetailsName: <index name>})

	db.coll.storageSize() - includes free space allocated to this collection

	db.coll.totalIndexSize() - size in bytes of all the indexes

	db.coll.totalSize() - storage allocated for all data and indexes

	db.coll.update(query, object[, upsert_bool, multi_bool]) - instead of two flags, you can pass an object with fields: upsert, multi

	db.coll.validate( <full> ) - SLOW

	db.coll.getShardVersion() - only for use with sharding

	db.coll.getShardDistribution() - prints statistics about data distribution in the cluster

	db.coll.getSplitKeysForChunks( <maxChunkSize> ) - calculates split points over all chunks and returns splitter function

	db.coll.getWriteConcern() - returns the write concern used for any operations on this collection, inherited from server/db if set

	db.coll.setWriteConcern( <write concern doc> ) - sets the write concern for writes to the collection

	db.coll.unsetWriteConcern( <write concern doc> ) - unsets the write concern for writes to the collection