Install Xcode CLI Tools without GUI

install-xcode-cli-tools.sh

#!/bin/bash

# See http://apple.stackexchange.com/questions/107307/how-can-i-install-the-command-line-tools-completely-from-the-command-line

echo "Checking Xcode CLI tools"
# Only run if the tools are not installed yet
# To check that try to print the SDK path
xcode-select -p &> /dev/null
if [ $? -ne 0 ]; then
  echo "Xcode CLI tools not found. Installing them..."
  touch /tmp/.com.apple.dt.CommandLineTools.installondemand.in-progress;
  PROD=$(softwareupdate -l |
    grep "\*.*Command Line" |
    head -n 1 | awk -F"*" '{print $2}' |
    sed -e 's/^ *//' |
    tr -d '\n')
  softwareupdate -i "$PROD" -v;
else
  echo "Xcode CLI tools OK"
fi

I tested the version from @That-Dude and it works under my VM of Big Sur 11.5.2. Catalina 10.15.3 fails.

Thank you for the code. I had to modify this slightly for it to run on Monterey 12.0.1. I have not regression tested this but it would be simple to check the OS version and use your original code for versions prior to Monterey (if this code doesn't work for them).

Work on macOS Catalina