german@mafalda:~$ shred -uv foo.py
shred: foo.py: paso 1/25 (random)...
shred: foo.py: paso 2/25 (bbbbbb)...
shred: foo.py: paso 3/25 (cccccc)...
shred: foo.py: paso 4/25 (aaaaaa)...
shred: foo.py: paso 5/25 (eeeeee)...
shred: foo.py: paso 6/25 (999999)...
shred: foo.py: paso 7/25 (111111)...
shred: foo.py: paso 8/25 (dddddd)...
shred: foo.py: paso 9/25 (249249)...
shred: foo.py: paso 10/25 (924924)...
shred: foo.py: paso 11/25 (ffffff)...
shred: foo.py: paso 12/25 (b6db6d)...
shred: foo.py: paso 13/25 (random)...
shred: foo.py: paso 14/25 (777777)...
shred: foo.py: paso 15/25 (6db6db)...
shred: foo.py: paso 16/25 (555555)...
shred: foo.py: paso 17/25 (666666)...
shred: foo.py: paso 18/25 (888888)...
shred: foo.py: paso 19/25 (db6db6)...
shred: foo.py: paso 20/25 (000000)...
shred: foo.py: paso 21/25 (222222)...
shred: foo.py: paso 22/25 (444444)...
shred: foo.py: paso 23/25 (492492)...
shred: foo.py: paso 24/25 (333333)...
shred: foo.py: paso 25/25 (random)...
shred: foo.py: borrando
shred: foo.py: renombrado a 000000
shred: 000000: renombrado a 00000
shred: 00000: renombrado a 0000
shred: 0000: renombrado a 000
shred: 000: renombrado a 00
shred: 00: renombrado a 0
shred: foo.py: borrado
german@mafalda:~$