xcodeselect.sh

#!/bin/bash
#author Federico Cappelli - github.com/federicocappelli - 2021 

if [ "$1" = "-h" ] || [ "$1" = "" ]; then
	echo
	echo "Select the command line tools for a specific Xcode version"
	echo "Please place your Xcodes in /Applications or ~/Applications and name them like Xcode_10.3.app"
	echo "examples:"
	echo "./xcodeselect.sh 11"
	echo "./xcodeselect.sh 10.3"
	echo "./xcodeselect.sh latest"
	echo
	exit 
fi

case $1 in

  "latest")
    appSuffix=""
    ;;
    *)
    appSuffix="_$1*"
    ;;
esac

developerFolderPath="/Applications/Xcode$appSuffix.app/Contents/Developer"
developerFolderPathUser="~/Applications/Xcode$appSuffix.app/Contents/Developer"

function doesAnyFileExist {
   local arg="$*"
   local files=($arg)
   [ ${#files[@]} -gt 1 ] || [ ${#files[@]} -eq 1 ] && [ -e "${files[0]}" ]
}

if doesAnyFileExist $developerFolderPath; then
    echo "Selecting xcode (at $developerFolderPath)" 
    sudo xcode-select --switch $developerFolderPath
else 
	if doesAnyFileExist $developerFolderPathUser; then
		echo "Selecting xcode at $developerFolderPath" 
    	sudo xcode-select --switch $developerFolderPathUser
	else 
    	echo "Error: Xcode $1 doesn't exist at $developerFolderPath"
    fi
fi