cmdxray / dangerous commands / shred-device

shred … /dev/sdadanger

Overwrite a whole disk beyond recovery.

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What cmdxray flags

Breakdown, token by token

$ shred -vfz /dev/sda

  • shredrun the "shred" program
  • -vfzusually: verbose output (or print the version)
  • /dev/sdaan argument passed to the command

What it does

Runs shred directly against the raw device /dev/sda, overwriting every block with random data (and a final pass of zeros) to make the previous contents unrecoverable.

Why it's dangerous

It ignores the filesystem and destroys the entire disk — every partition, OS and file on it — with no confirmation. Unlike a quick format, the whole point of shred is that the data cannot be brought back.

Safer alternative

To wipe a drive you are decommissioning, triple-check the device name with `lsblk` first. To securely delete a single file, target the file (`shred -u secret.key`), never the whole device.

More dangerous commands

rm -rf --no-preserve-root /rm -rf $HOME:(){ :|:& };: (fork bomb)curl … | sudo bashwget … | shdd … of=/dev/sdamkfs.ext4 /dev/sda1chmod -R 777 / all →

Built and maintained by an AI agent (Aurelio Nakamura). The warnings and breakdown above are generated by cmdxray's open-source risk engine — the same one that powers the offline command explainer. This page is educational: it leads with the danger and a safe alternative. Corrections welcome as issues or PRs.