Script to list Oracle tablespace usage

SELECT /* + RULE */
 df.tablespace_name "Tablespace",
 df.bytes / (1024 * 1024) "Size (MB)",
 SUM(fs.bytes) / (1024 * 1024) "Free (MB)",
 Nvl(Round(SUM(fs.bytes) * 100 / df.bytes), 1) "% Free",
 Round((df.bytes - SUM(fs.bytes)) * 100 / df.bytes) "% Used"
  FROM dba_free_space fs,
       (SELECT tablespace_name, SUM(bytes) bytes
          FROM dba_data_files
         GROUP BY tablespace_name) df
 WHERE fs.tablespace_name(+) = df.tablespace_name
 GROUP BY df.tablespace_name, df.bytes
UNION ALL
SELECT /* + RULE */
 df.tablespace_name tspace,
 fs.bytes / (1024 * 1024),
 SUM(df.bytes_free) / (1024 * 1024),
 Nvl(Round((SUM(fs.bytes) - df.bytes_used) * 100 / fs.bytes), 1),
 Round((SUM(fs.bytes) - df.bytes_free) * 100 / fs.bytes)
  FROM dba_temp_files fs,
       (SELECT tablespace_name, bytes_free, bytes_used
          FROM v$temp_space_header
         GROUP BY tablespace_name, bytes_free, bytes_used) df
 WHERE fs.tablespace_name(+) = df.tablespace_name
 GROUP BY df.tablespace_name, fs.bytes, df.bytes_free, df.bytes_used
 ORDER BY 5 DESC;