install-xcode.sh

#!/bin/bash
osx_vers=$(sw_vers -productVersion | awk -F "." '{print $2}')
cmd_line_tools_temp_file="/tmp/.com.apple.dt.CommandLineTools.installondemand.in-progress"

# Installing the latest Xcode command line tools on 10.9.x or higher

if [[ "$osx_vers" -ge 9 ]]; then
touch "$cmd_line_tools_temp_file";
PROD=$(softwareupdate -l |
  grep "\*.*Command Line" |
  head -n 1 | awk -F"*" '{print $2}' |
  sed -e 's/^ *//' |
tr -d '\n')
softwareupdate -i "$PROD";
fi

# Installing the latest Xcode command line tools on 10.7.x and 10.8.x

# on 10.7/10.8, instead of using the software update feed, the command line tools are downloaded
# instead from public download URLs, which can be found in the dvtdownloadableindex:
# https://devimages.apple.com.edgekey.net/downloads/xcode/simulators/index-3905972D-B609-49CE-8D06-51ADC78E07BC.dvtdownloadableindex

if [[ "$osx_vers" -eq 7 ]] || [[ "$osx_vers" -eq 8 ]]; then

	if [[ "$osx_vers" -eq 7 ]]; then
		DMGURL=http://devimages.apple.com/downloads/xcode/command_line_tools_for_xcode_os_x_lion_april_2013.dmg
	fi

	if [[ "$osx_vers" -eq 8 ]]; then
		 DMGURL=http://devimages.apple.com/downloads/xcode/command_line_tools_for_osx_mountain_lion_april_2014.dmg
	fi

		TOOLS=cltools.dmg
		curl "$DMGURL" -o "$TOOLS"
		TMPMOUNT=`/usr/bin/mktemp -d /tmp/clitools.XXXX`
		hdiutil attach "$TOOLS" -mountpoint "$TMPMOUNT" -nobrowse
		# The "-allowUntrusted" flag has been added to the installer
		# command to accomodate for now-expired certificates used
		# to sign the downloaded command line tools.
		installer -allowUntrusted -pkg "$(find $TMPMOUNT -name '*.mpkg')" -target /
		hdiutil detach "$TMPMOUNT"
		rm -rf "$TMPMOUNT"
		rm "$TOOLS"
fi