readme.md

Create macOS USB Installer

What you'll need...

• Apple computer
• USB drive with ≥ 8GB capacity
• Copy of macOS installer from the App Store

What you'll do...

Copy/paste this into Terminal

bash <(curl -Ls url.efmeeks.net/osx-usb-bash)

osx-usb.sh

#!/bin/bash
# Create macOS USB Installer
# url.efmeeks.net/osx-usb
clear
cat << eof
╭──────────────────────────────────────╮
│  To quit, press CTRL+C at any time.  │
╰──────────────────────────────────────╯
eof
pass() {
	echo "$1 = ok"
}
fail() {
	echo "$1 = fail"
	fail=1
}
getinstaller() {
	installer=''
	while [ -z "$installer" ]; do
		echo "Drag and drop the macOS installer here, then press ENTER"
		sleep 1
		open /Applications
		read installer
	done
}
getvolume() {
	volume=''
	while [ -z "$volume" ]; do
		echo "Drag and drop your USB volume here, then press ENTER"
		sleep 1
		open /Volumes
		read volume
	done
}
validate() {
	[ -d "$installer" ] && pass path || fail path
	[ -x "$installer/Contents/Resources/createinstallmedia" ] && pass createinstallmedia || fail createinstallmedia
}
makeusb() {
cat << eof
╭─────────────────────────────────────────╮
│ Writing the bootable image to USB       │
│ will take a considerable amount of time │
│ (especially USB 2.0)                    │
╰─────────────────────────────────────────╯
eof
	cim="$(find "$installer" -type f -name "createinstallmedia")"
	echo "Note: when prompted for your password, the prompt will remain blank as you type. This is normal."
	sudo "$cim" --volume "$volume" --applicationpath "$installer"
	echo "Done"
	echo "Ejecting disk"
	sudo diskutil ejectdisk "$volume"
}
# let's do it...
getinstaller
validate
[[ $fail == 1 ]] && exit
getvolume
makeusb
cat << eof
╭──────────────────────────────────────────╮
│ Now you can plug the USB drive into the  │
│ target machine, reboot, and hold ⌘R      │
│ then select the Installer as boot source │
╰──────────────────────────────────────────╯
eof