MACUSER$ mongod
2015-09-13T22:04:36.395-0400 E NETWORK [initandlisten] Failed to unlink socket file /tmp/mongodb-27017.sock errno:13 Permission denied
2015-09-13T22:04:36.395-0400 I - [initandlisten] Fatal Assertion 28578
2015-09-13T22:04:36.395-0400 I - [initandlisten]
***aborting after fassert() failure