sfill
Securely overwrite the free space and inodes of the partition where the specified directory resides. tldr-pages
On Linux
Linux
Overwrite free space and inodes of a disk with 38 writes (slow but secure)
sfill /path/to/mounted_disk_directoryIdentifyOverwrite free space and inodes of a disk with 6 writes (fast but less secure) and show status (verbose)
sfill -l -v /path/to/mounted_disk_directoryIdentifyOverwrite free space and inodes of a disk with 1 write (very fast but less secure verbose) and show status
sfill -ll -v /path/to/mounted_disk_directoryIdentifyOverwrite only free space of a dIsk
sfill -I /path/to/mounted_disk_directoryIdentifyOverwrite only free inodes of a disk
sfill -i /path/to/mounted_disk_directoryIdentify