shred -vfz -n 100 /dev/(h|s)d(a|b|c)
sample
shred -vfz -n 100 /dev/sdb
Here /dev/sdb is my whole hard disk. And I am asking shred to make (-n) 100 passes by overwriting the entire hard disk with (-z) zeros. And shred program (-f) forces the write by changing the permissions wherever necessary.
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