patternfill

clear
fillcheck="false"
while true
do
	if [[ $(/usr/bin/id -u) -ne 0 ]]; then
	echo "==================================================="
	echo " Ontrack Erasure Verification Pattern Fill Script  "
	echo "==================================================="
    echo "Please become root prior to running this script"
    echo "This can be done by typing "su" in most distros"
  	echo "==================================================="
    echo "Exiting script....."
  	echo "==================================================="
    exit
	fi
	if [[ $fillcheck = false ]]; then 
	echo "==================================================="
	echo " Ontrack Erasure Verification Pattern Fill Script  "
	echo "==================================================="
	echo "Enter (1) for 55aa Pattern (first pass)" 
	echo "Enter (2) for aa55 Pattern (second pass)"  
	echo "Enter (3) check status of last operation"        
	echo "Enter (q) to exit"
	echo "==================================================="
	fi
	echo "Enter your choice: "
	read -r choice
	case "$choice" in
		1) 	fillcheck="false"
			echo "=============================================="
			echo "Creating FIFO pipe named 55aa"
			mkfifo 55aa
			echo "=============================================="
			echo "=============================================="
			echo "Supplying FIFO file with 55aa datastream .."
			if [[ $OSTYPE == 'darwin'* ]]; then
  				export LC_ALL=en_US.ISO8859-1
			fi
			printf "%b" '\x55\xAA' | tr -d '\n' | xargs yes | tr -d '\n' > 55aa &
			echo "=============================================="
			echo "======================================"
			echo "Listing available storage devices.."
			if [[ $OSTYPE == 'darwin'* ]]; then
  				diskutil list 
			fi
			if [[ $OSTYPE == 'linux'* ]]; then
  				lsblk -a | sed '/loop/d'
			fi
			echo "========================================="
			echo "Type name of target storage device"
			echo "(ex "disk2s1" for mac ex "sdb" for linux) : "
			read -r "storagedevice"
			echo "Proceeding to fill $storagedevice with 55aa pattern."
			echo "Type (y) to continue "
			read -r confirmresponse
				case $confirmresponse in 
					y) if [[ $OSTYPE == 'darwin'* ]]; then
  							dd bs=32768 if=55aa of=/dev/$storagedevice &
						fi
						if [[ $OSTYPE == 'linux'* ]]; then
			  				dd bs=32768 iflag=fullblock if=55aa of=/dev/$storagedevice &
						fi
							echo "Fill Task Started, you may check progress with (3) at the main menu"
							echo "Press any key to go to main menu "
							read -r continue;;
					n) exit ;;
				esac;;
		2)	fillcheck="false"
			echo "=============================================="
			echo "Creating FIFO pipe named aa55"
			mkfifo aa55
			echo "=============================================="
			echo "=============================================="
			echo "Supplying FIFO file with aa55 datastream .."
			if [[ $OSTYPE == 'darwin'* ]]; then
  				export LC_ALL=en_US.ISO8859-1
			fi
			printf "%b" '\xAA\x55' | tr -d '\n' | xargs yes | tr -d '\n' > aa55 &
			echo "=============================================="
			echo "======================================"
			echo "Listing available storage devices.."
			if [[ $OSTYPE == 'darwin'* ]]; then
  				diskutil list 
			fi
			if [[ $OSTYPE == 'linux'* ]]; then
  				lsblk -a | sed '/loop/d'
			fi
			echo "========================================="
			echo "Type name of target storage device"
			echo "(ex "disk2s1" for mac ex "sdb" for linux) : "
			read -r "storagedevice"
			echo "Proceeding to fill $storagedevice with aa55 pattern."
			echo "Type (y) to continue "
			read -r confirmresponse
				case $confirmresponse in 
					y) 	if [[ $OSTYPE == 'darwin'* ]]; then
  							dd bs=32768 if=aa55 of=/dev/$storagedevice &
						fi
						if [[ $OSTYPE == 'linux'* ]]; then
			  				dd bs=32768 iflag=fullblock if=aa55 of=/dev/$storagedevice &
						fi
							echo "Fill Task Started, you may check progress with (3) at the main menu"
							echo "Press any key to go to main menu"
							read -r continue;;
					n) exit ;;
				esac;;
		3)		fillcheck="true"
				if [[ $! == '' ]]; then
					echo "There are no active fill operations running."
				fi
				if [[ $! != '' ]]; then
					if [[ $OSTYPE == 'darwin'* ]]; then
		  				kill -info $!
		  				echo $!
					fi
					if [[ $OSTYPE == 'linux'* ]]; then
		  				kill -s sigusr1 $!
					fi
				fi;;
		q) pkill -P $$
		   exit ;;
	esac
done