set path = ( /usr/local/pgsql/bin path )in the .login file in your home directory. If you use a variant of the Bourne shell, such as sh, ksh, or bash, then you would add
PATH=/usr/local/pgsql/bin:$PATH export PATHto the .profile file in your home directory. From now on, we will assume that you have added the Postgres bin directory to your path. In addition, we will make frequent reference to "setting a shell variable" or "setting an environment variable" throughout this document. If you did not fully understand the last paragraph on modifying your search path, you should consult the Unix manual pages that describe your shell before going any further.
If you have not set things up in the default way, you may have some more work to do. For example, if the database server machine is a remote machine, you will need to set the PGHOST environment variable to the name of the database server machine. The environment variable PGPORT may also have to be set. The bottom line is this: if you try to start an application program and it complains that it cannot connect to the postmaster, you must go back and make sure that your environment is properly set up.