Postgresql: Alter table SET WITHOUT OIDS for all databases/tables

#!/bin/bash
# remove OID from all tables in listed databases
# before execute: sudo su postgres

echo "Start removing OIDs";

for db in `psql -qAt -c "SELECT datname FROM pg_database WHERE datname != 'postgres' AND datallowconn = true ORDER BY datname;" postgres` ; do

    DATABASE_NAME="$db";
    echo "==============================";
    echo $DATABASE_NAME;

    for tbl in `psql -qAt -c "SELECT schemaname || '.' || tablename FROM pg_tables WHERE schemaname <> 'pg_catalog' AND schemaname <> 'information_schema';" $DATABASE_NAME` ; do
        psql -c "ALTER TABLE $tbl SET WITHOUT OIDS" $DATABASE_NAME ;
    done

done

echo "...done...";