macOS tools moving to my git

bootableBigSur.sh

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+#!/bin/bash
+ 
+####################
+# Notes            #                 
+####################
+#
+# Created 20200625 by Nathan Worster
+#
+# This script assumes that the macOS Beta installer is already staged in the Applications folder, and will convert that .app installer into a bootable .dmg.
+# To download the latest macOS beta, go to https://developer.apple.com/download/ or, if applicable, https://appleseed.apple.com/.
+# The .dmg file will be placed in ~/Downloads.
+# This script must be run with sudo using "sudo bash <filename>" if run outside of an MDM.
+# 
+####################
+# Variables        #
+####################
+ 
+dmgName=$"macOS11BigSurBeta"
+ 
+####################
+# Script           #
+####################
+ 
+cd ~/Downloads
+ 
+# Create and mount sparse volume:
+hdiutil create -o install_container -size 20G -layout SPUD -fs HFS+J -type SPARSE
+hdiutil attach install_container.sparseimage -noverify -mountpoint /Volumes/install_build
+ 
+# Copy contents of installer .app into mounted volume:
+/Applications/Install\ macOS\ Beta.app/Contents/Resources/createinstallmedia --nointeraction --volume /Volumes/install_build
+ 
+# Detach the completed image:
+hdiutil detach -force /Volumes/Install\ macOS\ Beta
+ 
+# Convert and rename the image:
+hdiutil convert install_container.sparseimage -format UDZO -o $dmgName.dmg
+ 
+# Cleanup
+ 
+rm install_container.sparseimage
+ 
+exit 0
+