A simple script for OSX for taking ISOs and imaging them onto USBs.

iso2usb.sh

#!/bin/bash

# iso2usb is a simple script for OSX to ease the conversion of an iso to an img file
# and then dd that img file to a USB of your choosing. You simply give it the iso
# as a parameter and then the disk number and it will take care of the rest.

# based on the commands here: http://www.ubuntu.com/download/desktop/create-a-usb-stick-on-mac-osx
# and the color commands here:  http://stackoverflow.com/questions/5947742/how-to-change-the-output-color-of-echo-in-linux

# exits out of the script upon error
set -e

# colors

# feel free to replace the color choices
# I made below with any of the following

BLACK='\033[0;30m'     
DGRAY='\033[1;30m'
RED='\033[0;31m'     
LRED='\033[1;31m'
GREEN='\033[0;32m'     
LGREEN='\033[1;32m'
ORANGE='\033[0;33m'     
YELLOW='\033[1;33m'
BLUE='\033[0;34m'     
LBLUE='\033[1;34m'
PURPLE='\033[0;35m'     
LPURPLE='\033[1;35m'
CYAN='\033[0;36m'     
LCYAN='\033[1;36m'
LGRAY='\033[0;37m'     
WHITE='\033[1;37m'
NC='\033[0m'

# beginning of actual script

if [ ! -z "$1" ]; then
	printf "\nNOTE: If you do not see ${GREEN}## \
COMPLETED SUCCESSFULLY ##${NC} prior to the script \
exitingthen something has gone wrong and you will \
need to investigate further.\n"
	printf "\n${RED}DO NOT ASSUME THAT THE USB IS USABLE!${NC}\n\n"
	printf "${GREEN}## FILE CONVERSION ##${NC}\n\n"
	img="${1%iso}img"
	printf "original: ${CYAN}$1${NC}\n" 
	printf "new file: ${PURPLE}$img${NC}\n"
	read -p "proceed (y/n): " ans
	if [ "$ans" == "y" ]; then	
		hdiutil convert -format UDRW -o "$img" "$1"
		mv "$img.dmg" "$img"
	else
		printf "exiting script..\n"
		exit 0
	fi
	printf "\n${GREEN}## EJECT USB ##${NC}\n\n"
	diskutil list
	echo ""
	read -p "which disk is being ejected - enter number only: " usrinp
	printf "eject ${GREEN}/dev/disk$usrinp${NC} and img (y/n): " 
	read ans
	if [ "$ans" == "y" ]; then
		diskutil unmountDisk "/dev/disk$usrinp"
		printf "\n${GREEN}## IMAGING USB ##${NC}\n\n"
		printf "If requested, enter password to begin imaging..\n"
		printf "\n${GREEN}NOTE: dd produces no output until completion. It will look like it is not doing anything. This is perfectly normal. Please be patient.${NC}\n\n"
        sudo dd if="$img" of="/dev/rdisk$usrinp" bs=1m
		printf "\n${GREEN}## COMPLETED SUCCESSFULLY ##${NC}\n\n"
	else
		printf "exiting script..\n"
		exit 0
	fi	
else
	printf "${RED}ERROR:${NC} No file name given\n"
fi