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shred - Overwrite the specified FILE(s) repeatedly, in order to make it harder for even very expensive hardware probing to recover the data.
To permanently delete all files within a folder (e.g. Documents) and subfolders, use the following command:
find Documents/ -type f -exec shred -uvz {} \;
After the command has been executed, all files are irretrievably deleted. Only the (sub)folders remain. To delete the empty (sub)folders, use the follwoing command:
rm -r Documents/
You can also use shred to permanently delete one file only:
shred -uvz example.txt
Default overwrites file always three times; u - deallocate and remove file after overwriting; v - show progress; z - add a final overwrite with zeros to hide shredding