Linux Secure Delete
From Hack Sphere Labs Wiki
sudo apt-get install secure-delete
This has four tools:
srm - securely delete an existing file smem - securely delete traces of a file from ram sfill - wipe all the space marked as empty on your hard drive sswap - wipe all the data from you swap space.
dd if=/dev/zero of=/dev/sdX iflag=nocache oflag=direct bs=4096
- Progress of DD
while [ 1 ]; do kill -USR1 $(pidof dd) sleep 5; done