sfill

Securely overwrite the free space and inodes of the partition where the specified directory resides. More information: https://manned.org/sfill.

• Overwrite free space and inodes of a disk with 38 writes (slow but secure):
  sfill {{/path/to/mounted_disk_directory}}
• Overwrite free space and inodes of a disk with 6 writes (fast but less secure) and show status:
  sfill -l -v {{/path/to/mounted_disk_directory}}
• Overwrite free space and inodes of a disk with 1 write (very fast but insecure) and show status:
  sfill -ll -v {{/path/to/mounted_disk_directory}}
• Overwrite only free space of a disk:
  sfill -I {{/path/to/mounted_disk_directory}}
• Overwrite only free inodes of a disk:
  sfill -i {{/path/to/mounted_disk_directory}}