how-to backup all the database schemas of all the databases on Netezza

export base_dir=/tmp/
nzsql -d SYSTEM -tqA -c "select datname from _t_database;"| sort  | { while read db ; do ( mkdir -p $base_dir/$db ; test `nzsession | wc -l` -lt 300 && nzdumpschema -R $db $base_dir/$db/create-$db-database.sh $base_dir/  & ) ; done ;  }