TLDR
Enter a command. For example: ncal, po4a gettextize, uuid, hcitool.

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}}

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