Overwrite a file to make the contents unrecoverable, and delete the file afterwards if requested.
Shred standard output.
Force permissions to allow writing to files.
Print help message and exit.
Overwrite files num times (default is 25).
Shred num bytes. num can be expressed with suffixes (e.g., K, M, or G).
Remove file after overwriting. shred does not remove the file unless this option is specified.
Print version information and exit.
Shred the exact file size; do not round up to the next full block.
On the final pass, overwrite with zeros to hide the shredding.