ileep@dileep-VirtualBox:~$ mongod
mongod --help for help and startup options
Mon Sep 16 16:33:15.184 [initandlisten] MongoDB starting : pid=4007 port=27017 dbpath=/data/db/ 64-bit host=dileep-VirtualBox
Mon Sep 16 16:33:15.185 [initandlisten] db version v2.4.6
Mon Sep 16 16:33:15.185 [initandlisten] git version: b9925db5eac369d77a3a5f5d98a145eaaacd9673
Mon Sep 16 16:33:15.185 [initandlisten] build info: Linux ip-10-2-29-40 2.6.21.7-2.ec2.v1.2.fc8xen #1 SMP Fri Nov 20 17:48:28 EST 2009 x86_64 BOOST_LIB_VERSION=1_49
Mon Sep 16 16:33:15.186 [initandlisten] allocator: tcmalloc
Mon Sep 16 16:33:15.186 [initandlisten] options: {}
Mon Sep 16 16:33:15.187 [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
Mon Sep 16 16:33:15.188 dbexit:
Mon Sep 16 16:33:15.189 [initandlisten] shutdown: going to close listening sockets...
Mon Sep 16 16:33:15.189 [initandlisten] shutdown: going to flush diaglog...
Mon Sep 16 16:33:15.189 [initandlisten] shutdown: going to close sockets...
Mon Sep 16 16:33:15.189 [initandlisten] shutdown: waiting for fs preallocator...
Mon Sep 16 16:33:15.190 [initandlisten] shutdown: lock for final commit...
Mon Sep 16 16:33:15.190 [initandlisten] shutdown: final commit...
Mon Sep 16 16:33:15.190 [initandlisten] shutdown: closing all files...
Mon Sep 16 16:33:15.190 [initandlisten] closeAllFiles() finished
Mon Sep 16 16:33:15.190 dbexit: really exiting now