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@Kromey Kromey/disk_wipe.sh
Last active May 11, 2017

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This simple Bash script functions as a wrapper around dd, for the purpose of wiping a disk or partition while providing progress feedback to the user.
#!/bin/bash
# disk_wipe.sh
# Author: Kromey (http://kromey.us/)
# This simple Bash script leverages the dd utility to provide user feedback
# as progress is made, designed for the purpose of wiping hard drives or
# partitions. This script reads from /dev/zero to most efficiently zero-out
# the target device or partition.
#
# BEGIN CONFIG
#
#Commands
DD=`which dd`
RM=`which rm`
KILL=`which kill`
#Source file for overwrite
SOURCE=/dev/zero
#Destination device for suppressed output
NULL=/dev/null
#Temporary file for the script
TMP=/tmp/disk_wipe
#
# END CONFIG
# DO NOT EDIT BELOW THIS LINE!
#
#Script's first parameter is the disk to wipe
DISK=$1
#This function monitors the dd process and provides near-real-time feedback
function monitor() {
#Sending the USR1 signal to dd causes it to output progress
while $KILL -USR1 $1 > $NULL 2>&1
do
#Parse out the current progress
PROGRESS=`awk '/copied/ {print $1, "bytes", $3, $4}' $TMP`
#Empty our temp file
echo $NULL > $TMP
#Output progress, overwriting the previous progress line
printf "\r$PROGRESS"
#Pause for a quick breath
sleep 0.25
done
}
#Clean up after ourselves
function clean_up() {
#Give us a new line
echo
#Kill the dd command, if it isn't already stopped
$KILL $PID_DD > $NULL 2>&1
#Remove our temp file
$RM $TMP
#Aaaaand we're done
exit
}
#Catch the most common "stop" signals, and clean up
trap clean_up SIGHUP SIGINT SIGTERM
#Start the disk wipe
$DD if=$SOURCE of=$DISK bs=16M > $TMP 2>&1 & PID_DD=$!
echo Started dd with PID $PID_DD
#Keep an eye on our progress
monitor $PID_DD
#Clean up after ourselves
clean_up
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