Set up Postgresql-93 on Centos 7

I had the same problem and solve it by changing the path

/usr/pgsql-9.3/bin/postgresql93-setup initdb

Note that the path is different

CentOS 7 is based on systemd. PostgreSQL packages use a different command for initdb there:

/usr/lib/pgsql-9.3/bin/postgresql93-setup initdb

On older versions, call the initscript directly.

/etc/init.d/postgresql-9.3 initdb