Cannot log in with default user on Mac 10.10 I am running PostgreSQL on a Mac 10.10


  PostgreSQL 9.3.5 on x86_64-apple-darwin12.5.0, compiled by Apple LLVM version 5.1 (clang-503.0.40) (based on LLVM 3.4svn), 64-bit 


I am having trouble connecting to the _postgres Mac account. As far as I remember, the under Mac created account is not postgres but _postgres. I want to log in as that account to access Postgres and create a new role/database for some user on the system. 

sudo -u _postgres psql


Throws me this:


  psql: FATAL:  role "_postgres" does not exist


While:

sudo -u postgres psql 


gives me this:


  sudo: unknown user: postgres


So, how to login as the default Postgres user?!
Just try your normal user account. 
bash# psql postgres. 
Depending on how you installed PostgreSQL (homebrew, ports or Postgres.app) the default account is set to your account instead of a seperate one. Beside this, consider to update to 9.3.11