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set heading off
set lines 120

SELECT 'dd of=' || f.file_name || ' bs=8192 conv=notrunc seek=' ||
       to_number(s.header_block + 1) || ' << EOF',
       '##corruptedbloc##',
       'EOF'
  FROM dba_segments s
  JOIN dba_tables t ON s.owner = t.owner AND s.segment_name = t.table_name
  JOIN dba_data_files f ON f.tablespace_name = t.tablespace_name
 WHERE (t.owner, t.table_name) = ('TEST', 'TEST');