sudo apt update
sudo apt install -y git coreutils vim screen
git clone https://github.com/pgporada/autoshred && cd autoshred
mv autoshred.example.conf autoshred.conf
lsblk
# Configure your exclusion list to drives that should not be wiped
vim autoshred.conf

sudo crontab -e
@reboot /usr/bin/screen -d -m /home/pi/autoshred/autoshred.sh -f

./autoshred -h

sudo ./autoshred -f

screen -ls
ps aux | grep shred

vagrant up
vagrant ssh

vagrant@ubuntu-xenial:/vagrant$ sudo dd if=/dev/zero of=MyDrive.img bs=1M count=500
500+0 records in
500+0 records out
524288000 bytes (524 MB, 500 MiB) copied, 2.90638 s, 180 MB/s

vagrant@ubuntu-xenial:/vagrant$ sudo fdisk MyDrive.img

Welcome to fdisk (util-linux 2.27.1).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.

Device does not contain a recognized partition table.
Created a new DOS disklabel with disk identifier 0x5cb4896a.

Command (m for help): p
Disk MyDrive.img: 500 MiB, 524288000 bytes, 1024000 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x5cb4896a

Command (m for help): n
Partition type
   p   primary (0 primary, 0 extended, 4 free)
   e   extended (container for logical partitions)
   Select (default p): p
   Partition number (1-4, default 1): 1
   First sector (2048-1023999, default 2048):
   Last sector, +sectors or +size{K,M,G,T,P} (2048-1023999, default 1023999):

   Created a new partition 1 of type 'Linux' and of size 499 MiB.

   Command (m for help): w
   The partition table has been altered.
   Syncing disks.

vagrant@ubuntu-xenial:/vagrant$ sudo mkfs -t ext4 MyDrive.img
mke2fs 1.42.13 (17-May-2015)
Found a dos partition table in MyDrive.img
Proceed anyway? (y,n) y
Creating filesystem with 512000 1k blocks and 128016 inodes
Filesystem UUID: 48ea4ef2-6393-46e4-b35b-ddf06b27e6a4
Superblock backups stored on blocks:
8193, 24577, 40961, 57345, 73729, 204801, 221185, 401409

Allocating group tables: done
Writing inode tables: done
Creating journal (8192 blocks): done
Writing superblocks and filesystem accounting information: done

vagrant@ubuntu-xenial:/vagrant$ sudo mount -t ext4 MyDrive.img /media/test/

vagrant@ubuntu-xenial:/vagrant$ lsblk
NAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda      8:0    0   10G  0 disk
└─sda1   8:1    0   10G  0 part /
sdb      8:16   0   10M  0 disk
loop0    7:0    0  500M  0 loop /media/test