"That's only true for GNU-based userlands, not BSD-based ones. " RM(1) BSD General Commands Manual RM(1) ... -P

"That's only true for GNU-based userlands, not BSD-based ones. " RM(1) BSD General Commands Manual RM(1) ... -P Overwrite regular files before deleting them. Files are overwritten three times, first with the byte pattern 0xff, then 0x00, and then 0xff again, before they are deleted.