in ODOC

ODOC: shred

shred — Overwrite/Delete a file securely.

Summary:

Overwrite the specified file repeatedly and remove, in order to make it harder for even very expensive hardware probing to recover the data.

Example:

$ shred file — Repeatedly overwrite the file content with random data.

$ shred -v file — Show progress info.

$ shred -n 5 file — Overwrite 5 times instead of the default is 25.

$ shred -x file — Use exact file size. Don’t round off.

$ shred -z file — At the end of shred, overwrite the file with zeros.

$ shred -u file — Overwrite, Truncate and Remove the file.

Read: man shred

shred, odoc, linux, gnu/linux