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

Thanks for this! Had same issue of needing to install over ssh over vpn, so no chance to get at the GUI (also had to remove the -v)

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