zerofree(8) on Linux
The text d2e3c63d37a9, as Debian 6.0 (Squeeze) shipped it.
zero free blocks from ext2/3 file-systems
Flags it lists
-
-n -
-v
The text d2e3c63d37a9, as Debian 6.0 (Squeeze) shipped it.
zero free blocks from ext2/3 file-systems
-n
-v