Linux Secure Delete

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.

Wipe Drive Erase

dd command

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

Notes

• https://wiki.archlinux.org/index.php/Securely_wipe_disk#Checking_progress_of_dd_while_running