Postgres 9.1 backup script to Cron

postgres_backup.sh

#!/bin/bash

# script by http://www.emidioleite.com.br/um-simples-script-para-backup-de-bases-postgres-sql-usando-linux/
# thanks! 

# Location to place backups.
backup_dir="$1"

#String to append to the name of the backup files
backup_date=`date +%Y-%m-%d`

#Numbers of days you want to keep copie of your databases
number_of_days=30

databases=`/usr/lib/postgresql/9.1/bin/psql -l -t | cut -d'|' -f1 | sed -e 's/ //g' -e '/^$/d'`
for i in $databases; do
  if [ "$i" != "template0" ] && [ "$i" != "template1" ]; then
    echo Dumping $i to $backup_dir$i\_$backup_date
    /usr/bin/pg_dump $i > $backup_dir$i\_$backup_date
  fi
done
find $backup_dir -type f -prune -mtime +$number_of_days -exec rm -f {} \;