Postgres Cron Backups

#!/bin/bash
PG_USER="postgres"
SUDO_CMD=$(which sudo)
SUDO="$SUDO_CMD -u $PG_USER"
PSQL_CMD=$(which psql)
PSQL="$SUDO $PSQL_CMD"
GREP=$(which grep)
AWK=$(which awk)
PGDUMP_CMD=$(which pg_dump)
PGDUMP="$SUDO $PGDUMP_CMD"
VACUUM_CMD=$(which vacuumdb)
VACUUM="$SUDO $VACUUM_CMD"
FIND=$(which find)

# Bellow is how old, in days, a backup will need to be deleted.
# This helps cleaning up and don't keep piling backups
MAX_DAYS=3

# Backups destination directory
BACKUPS_DIR="/var/backups/postgresql"

# To get a list of all databases uncomment the following 3 lines
#DBS=$($PSQL -q -c "\l" | sed -n 4,/\eof/p | grep -v rows\) | grep -v template0 | grep -v template1 | awk {'print $1'} | grep -v :)
#echo $DBS
#exit

# Uncomment bellow to backup all databases
#DBS=$($PSQL -q -c "\l" | sed -n 4,/\eof/p | grep -v rows\) | grep -v template0 | grep -v template1 | awk {'print $1'} | grep -v :)

# Uncomment bellow and add the database names you wish to back separated with a white-space
#DBS=""

for DB in $DBS
    do
        echo -n "Vacuum'ing database $DB ... "
        $($VACUUM $DB)
        echo "Done."
        BACKUP_NAME="$BACKUPS_DIR/$DB-backup-$(date +%Y-%m-%d).sql.tar"
        echo -n "Creating backup of database $DB ... "
        $($PGDUMP -o -F t $DB > $BACKUP_NAME)
        echo "Done."
        echo -n "Removing backups of database $DB older than $MAX_DAYS days ... "
        $($FIND $BACKUPS_DIR -name "$DB*" -type f -mtime +3 -delete)
        echo "Done."
        echo "----8<----8<----8<----8<----8<----8<----8<----8<----8<----8<----8<----8<----8<----"
  done