versions$ mongod --repair
2013-09-01T13:58:24.142-0400 [initandlisten] MongoDB starting : pid=17599 port=27017 dbpath=/data/db/ 64-bit host=Daniels-MacBook-Air-2.local
2013-09-01T13:58:24.143-0400 [initandlisten]
2013-09-01T13:58:24.143-0400 [initandlisten] ** NOTE: This is a development version (2.5.2) of MongoDB.
2013-09-01T13:58:24.143-0400 [initandlisten] **       Not recommended for production.
2013-09-01T13:58:24.143-0400 [initandlisten]
2013-09-01T13:58:24.143-0400 [initandlisten] db version v2.5.2
2013-09-01T13:58:24.143-0400 [initandlisten] git version: b283169ae51328f3fb5e3c8a3c9017a2e42c148f
2013-09-01T13:58:24.143-0400 [initandlisten] build info: Darwin bs-osx-106-x86-64-2.10gen.cc 10.8.0 Darwin Kernel Version 10.8.0: Tue Jun  7 16:32:41 PDT 2011; root:xnu-1504.15.3~1/RELEASE_X86_64 x86_64 BOOST_LIB_VERSION=1_49
2013-09-01T13:58:24.143-0400 [initandlisten] allocator: system
2013-09-01T13:58:24.143-0400 [initandlisten] options: { repair: true }
2013-09-01T13:58:24.154-0400 [initandlisten]
2013-09-01T13:58:24.163-0400 [initandlisten] ****
2013-09-01T13:58:24.163-0400 [initandlisten] need to upgrade database a with pdfile version 4.5, new version: 4.5
2013-09-01T13:58:24.163-0400 [initandlisten] 	 starting upgrade
2013-09-01T13:58:24.163-0400 [initandlisten] a repairDatabase a