Daily Vacuums

Hi!

I'm trying to vacuum my db on daily basis -> cos it's exploding otherwise. I'm just wondering wheter to put this file to my server... So will this do the trick when put into /etc/cron.daily/ folder?

postgres.cron:

#!/bin/bash
DBNAME=db

#Vacuum
su - postgres -c "/usr/bin/vacuumdb -f $DBNAME"

Do I need to edit any other files in order for it to work ???

Thx for helps,

Miska

###EDIT###
Ok, It works this way...