Installation Problems

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<http://stackoverflow.com/questions/35566525/permission-denied-when-connecting-to-server-postgres#>

Hi al,

I installed Postgres9.5.1 via Homebrew. However, I am having problems
creating a database by using "createdb". Originally the message said:
"createdb: command not found". Then I uninstall and install Homebrew and
updated Postgres.

However, now I am getting a new error:

createdb: could not connect to database template1: could not connect
to server: No such file or directory
Is the server running locally and accepting
connections on Unix domain socket "/tmp/.s.PGSQL.5432"?

I tried a couple of things such as:

$rm /usr/local/var/postgres/postmaster.pid

which gave back:

"Permission denied"

Also:

$postgres -D /usr/local/var/postgres
postgres cannot access the server configuration file
"/usr/local/var/postgres/postgresql.conf": Permission denied

Or:

$grep unix_socket /usr/local/var/postgres/postgresql.conf
grep: /usr/local/var/postgres/postgresql.conf: Permission denied

I don't know what to do, I don't really understand what is going on. Thanks.