test# export PGPASSWORD="xxxxxxx"; for database in `psql --username=postgres --command='list' -h localhost | grep '^ [a-zA-Z0-9]' | awk '{print $1};'`; do pg_dump -U postgres ${database} > ${database}.sql; done

pg_dump: [archiver (db)] connection to database "template0" failed: FATAL:  database "template0" is not currently accepting connections