macosprep.sh

#!/usr/bin/env bash

# Ask for the administrator password upfront
sudo -v

# Keep-alive: update existing `sudo` time stamp until `macosprep.sh` has finished
while true; do sudo -n true; sleep 60; kill -0 "$$" || exit; done 2>/dev/null &

# Step 1: Update the OS and Install Xcode Tools
echo "------------------------------"
echo "Updating macOS.  If this requires a restart, run the script again."
# Install all available updates
sudo softwareupdate -ia
# Install only recommended available updates
#sudo softwareupdate -irv
softwareupdate --install-rosetta --agree-to-license

echo "------------------------------"
echo "Installing Xcode Command Line Tools."
# Install Xcode command line tools

# https://developer.apple.com/forums/thread/698954
# Only run if the tools are not installed yet
# To check that try to print the SDK path
xcode-select -p &> /dev/null
if [ $? -ne 0 ]; then
  echo "Command Line Tools for Xcode not found. Installing from softwareupdate…"
  # This temporary file prompts the 'softwareupdate' utility to list the Command Line Tools
  touch /tmp/.com.apple.dt.CommandLineTools.installondemand.in-progress;
  PROD=$(softwareupdate -l | grep "\*.*Command Line" | tail -n 1 | sed 's/^[^C]* //')
  softwareupdate -i "$PROD" --verbose;
  rm /tmp/.com.apple.dt.CommandLineTools.installondemand.in-progress;
else
  echo "Command Line Tools for Xcode have been installed."
fi