Segue um script parecido so que em ShellScript:

#/usr/local/bin/bash

PSQL=`which psql`
GREP=`which grep`
AWK=`which awk`
PGDUMP=`which pg_dump`

# Informacoes sobre banco
DBHOST='localhost'             # IP do Host que deseja backupear
PGUSER='pguser'                # Usuario do Postgres que vc utiliza
PGPORT='5432'                  # Porta do Postgres que vc utiliza - Default 5432

for bancos in `$PSQL -U $PGUSER -h $DBHOST -l | $GREP pguser | $AWK '{print$1}'`
do
    DUMP_FILE="/tmp/123/dump${bancos}.dump"
    echo "Backup :"${bancos}
    $PGDUMP -d $bancos -h $DBHOST -p $PGPORT -U $PGUSER -Fc -f $DUMP_FILE
    echo "++++++++++++++++++++++++++++++++++++++++++++++++++++++++"
done

Forte abraço e parabéns pelo blog!