Secure file Erase

TARGET=$1

if [ -z $TARGET ];
then
        echo "You must specify a file to destroy";
else
        if [ ! -w $TARGET ];
        then
                echo "Cannot write target file, do you have permissions?";
        else
                SIZE=`stat -c%s $TARGET`;
                URL="http://www.random.org/cgi-bin/randbyte?nbytes=$SIZE&format=f"


                if [ $SIZE -lt 1 ];
                then
                        echo "ERROR: Unable to stat file";
                else

                        if [ -z $2 ];
                        then
                                ITERATIONS=32;
                        else
                                ITERATIONS=$2
                        fi

                        echo "Killing $TARGET; FileSize $SIZE; $ITERATIONS iterations";

                        for i in `seq 1 $ITERATIONS`;
                        do
                                (curl $URL > ./rand) 2>/dev/null
                                dd if=./rand of=$TARGET bs=1 count=$SIZE 2>/dev/null;
                                rm -f ./rand;
                                echo "Iteration $i Finished";
                        done

                        dd if=/dev/zero of=$TARGET bs=1 count=$SIZE 2>/dev/null;

                        rm -f $TARGET;
                fi
        fi
fi