shell/.local/bin/wipe

   1 #!/bin/bash
   2 set -ue
   3
   4 if [ $# -eq 1 ]; then
   5         dev=$1
   6 elif [ $# -eq 0 ]; then
   7         select dev in $(ls /sys/class/block/); do break; done
   8 else
   9         echo "Usage: $0 [device]"
  10         echo "e.g.: $0 /dev/sda"
  11         exit 1
  12 fi
  13
  14 size="$(($(cat "/sys/class/block/$dev/size")*512))"
  15 dev="/dev/$dev"
  16 echo "Select $dev with size $(numfmt --to=iec-i $size) or $size bytes"
  17
  18 read -p "Are you sure? It will wipe $dev [y/n]" r
  19 if [ "$r" != y ]; then
  20         echo "Answer y to proceed"
  21         exit 1
  22 fi
  23
  24 pv -aeprts "$size" /dev/zero | sudo dd of="$dev" bs=4096
  25 sync