bash script for adding permissions on every table in every database on postgresql

gistfile1.sh

#!/bin/bash
hostname="my.db.server.hostname.com"
user="myusername"

#get a list of all the databases
databases=`psql -wl -h $hostname | sed -n 4,/\eof/p | grep -v rows\) | grep -v template0 | grep -v template1 | grep -v ":" | awk {'print $1'}`

for database in $databases; do
  #get a list of all the tables
  tables=$(psql -h $hostname $database -A -t -c "SELECT table_name FROM information_schema.tables WHERE table_schema = 'public';")
	for table in $tables ; do
		echo "Granting select to $user on $table"
		psql -h $hostname $database -c "GRANT SELECT ON $table to $user;"
	done
done