failed to create directory in postgresql - Mailing list pgsql-admin

I'm trying to create the directory but unable to do it. I don't find this command anywhere in postgresql. But the EDB suggests using this command to create a directory.

postgres=# create directory utildir as '/tmp/utildir';
ERROR:  syntax error at or near "directory"
LINE 1: create directory utildir as '/tmp/utildir';
               ^

Regards,

Nikhil