wdisk

   1 #!/bin/sh
   2
   3 # wdisk
   4 # File ID: 8945d66e-5d49-11df-8e4e-90e6ba3022ac
   5 # Overwrites fre space on a disk.
   6 # Should be run as root to overwrite super-user reserved space.
   7
   8 [ -z $1 ] && { echo "Syntax: $0 directory" ; exit 1; }
   9
  10 wdir=$1
  11 [ -d $wdir ] || { echo "$0: $wdir: Not a directory" >&2; exit 1; }
  12 [ -w $wdir ] || { echo "$0: $wdir: Need write access to this directory" >&2; exit 1; }
  13 datafil=$wdir/wdata.tmp
  14 count=1
  15
  16 while :; do
  17         echo -n Creating $datafil...
  18         head -c 1234157 /dev/urandom >$datafil
  19         echo OK
  20         echo -n Filling disk...
  21         cat <$datafil >>$datafil 2>/dev/null
  22         echo OK
  23         ls -l $datafil
  24         echo -n sync...
  25         sync
  26         echo OK
  27         echo -n sleep...
  28         sleep 5
  29         echo OK
  30         echo -n Removing $datafil...
  31         rm -fv $datafil
  32         echo OK
  33         echo ==== $count wipes done ====
  34         echo
  35         count=$[$count+1]
  36 done