Create OS X Boot Disk

create_osx_boot.sh

#!/usr/bin/env bash
#
#
#  create boot disks from OSX Installers
#
#  This script makes the following assumptions when creating a bootable USB drive.
#  1. You have downloaded the installer from the AppStore, and it is sitting in
#  the /Applications directory (the default location.)
#  2. you have a freshly formatted USB drive with the following characteristics:
#   - at least 8GB in size
#   - Formatted "Mac OS Extended (Journaled)"
#   - GUID Partition Map
#   - the volume is titled "Untitled"
#
#  Execute using the following command:
#  create_osx_boot.sh < Mavericks | Yosemite | ElCapitan | Sierra >
#
#  v.2016-09-22 by bill@wellingtonnet.net

########################################################################################

# set some variables

if [[ "$1" = "Sierra" ]]; then
    APPLICATION_PATH='/Applications/Install macOS Sierra.app'
elif [[ "$1" = "ElCapitan" ]]; then
    APPLICATION_PATH='/Applications/Install OS X El Capitan.app'
elif [[ "$1" = "Yosemite" ]]; then
    APPLICATION_PATH='/Applications/Install OS X Yosemite.app'
elif [[ "$1" = "Mavericks" ]]; then
    APPLICATION_PATH='/Applications/Install OS X Mavericks.app'
else
    echo "sorry:  no option available for ${1}"
    exit
fi

INSTALLER_PATH="$APPLICATION_PATH/Contents/Resources/createinstallmedia"
DESTINATION_VOL='/Volumes/Untitled'


# ok let's get to work

sudo "${INSTALLER_PATH}" --volume "${DESTINATION_VOL}" --applicationpath "${APPLICATION_PATH}" --nointeraction