$ curl -sLO http://downloads.mongodb.org/src/mongodb-src-r2.6.1.tar.gz
$ tar xzvf mongodb-src-r2.6.1.tar.gz
$ mongodb-osx-x86_64-2.6.1/bin/mongod
mongodb-osx-x86_64-2.6.1/bin/mongod --help for help and startup options
2014-05-06T00:29:42.807-0400 [initandlisten] MongoDB starting : pid=69969 port=27017 dbpath=/data/db 64-bit host=mbp.local
2014-05-06T00:29:42.807-0400 [initandlisten]
2014-05-06T00:29:42.807-0400 [initandlisten] ** WARNING: soft rlimits too low. Number of files is 256, should be at least 1000
2014-05-06T00:29:42.807-0400 [initandlisten] db version v2.6.1
2014-05-06T00:29:42.807-0400 [initandlisten] git version: 4b95b086d2374bdcfcdf2249272fb552c9c726e8
2014-05-06T00:29:42.807-0400 [initandlisten] build info: Darwin mci-osx108-6.build.10gen.cc 12.5.0 Darwin Kernel Version 12.5.0: Sun Sep 29 13:33:47 PDT 2013; root:xnu-2050.48.12~1/RELEASE_X86_64 x86_64 BOOST_LIB_VERSION=1_49
2014-05-06T00:29:42.807-0400 [initandlisten] allocator: system
2014-05-06T00:29:42.807-0400 [initandlisten] options: {}
2014-05-06T00:29:42.807-0400 [initandlisten] exception in initAndListen: 10296
*********************************************************************
 ERROR: dbpath (/data/db) does not exist.
 Create this directory or give existing directory in --dbpath.
 See http://dochub.mongodb.org/core/startingandstoppingmongo
*********************************************************************
, terminating
2014-05-06T00:29:42.807-0400 [initandlisten] dbexit:
2014-05-06T00:29:42.807-0400 [initandlisten] shutdown: going to close listening sockets...
2014-05-06T00:29:42.807-0400 [initandlisten] shutdown: going to flush diaglog...
2014-05-06T00:29:42.807-0400 [initandlisten] shutdown: going to close sockets...
2014-05-06T00:29:42.807-0400 [initandlisten] shutdown: waiting for fs preallocator...
2014-05-06T00:29:42.807-0400 [initandlisten] shutdown: lock for final commit...
2014-05-06T00:29:42.807-0400 [initandlisten] shutdown: final commit...
2014-05-06T00:29:42.807-0400 [initandlisten] shutdown: closing all files...
2014-05-06T00:29:42.807-0400 [initandlisten] closeAllFiles() finished
2014-05-06T00:29:42.807-0400 [initandlisten] dbexit: really exiting now

$ curl -sIL http://dochub.mongodb.org/core/startingandstoppingmongo | grep ^Location
Location: http://www.mongodb.org/dochub/core/startingandstoppingmongo
Location: http://www.mongodb.org/display/DOCS/Starting+and+Stopping+Mongo;jsessionid=04BF87C16D5E4A50DFDC4070D4B5AC7F
Location: http://wiki.10gen.com/display/DOCS/Starting+and+Stopping+Mongo%3bjsessionid=04BF87C16D5E4A50DFDC4070D4B5AC7F
Location: https://wiki.mongodb.com/display/DOCS/Starting+and+Stopping+Mongo%3bjsessionid=04BF87C16D5E4A50DFDC4070D4B5AC7F
Location: https://wiki.mongodb.com/login.action;jsessionid=353A68087D46042BB1A5EED82DABA359?os_destination=%2Fpages%2Fviewpage.action%3Ftitle%3DStarting%2Band%2BStopping%2BMongo%253Bjsessionid%253D04BF87C16D5E4A50DFDC4070D4B5AC7F%26spaceKey%3DDOCS