function jaaENV {
	if [ "$1" = "--help" ]; then
		echo "Utility to combine nvm/sdk/… in one script/config file '.jaaENV'"
		echo "	 ↘ instead of 'nvm use 16 & sdk use …'"
		echo ""
		echo "Usage:"
		echo "	jaaENV"
		echo "	jaaENV [--help|--ls]"
		echo "	jaaENV --save …to_save (example: jaaENV --save nodejs php)"
		echo ""
		echo "Description:"
		echo "	- Without arguments loads infos from '.jaaENV'"
		echo "	- 'ls' shows supported options to auto load"
		echo "	- 'save' cerates config file '.jaaENV'"
		echo ""
		echo "Usage '.jaaENV' files: "
		echo "	  typical: '\nphp=5.6\nnodejs=16.13.0'"
		echo "		 link: '. ../.jaaENV' … use settings from parent folder"
		echo "	Options:"
		echo "		'android_home': Exports 'ANDROID_HOME' (uses 'ANDROID_HOME_BAK') instead of new 'ANDROID_SDK_ROOT'. Value can be anything (use '1')."
		echo "		         'jdk': Exports 'JAVA_HOME' based on wanted version (currently 11/1.8)"
		echo "		'nodejs'|'php': NodeJS/PHP versions"
		echo "		      'gradle': Cordova uses folder scoped → so unnecesarly"
		echo ""
		echo "Install: "
		echo "	  gradle ⇒ https://sdkman.io/"
		echo "		node ⇒ https://github.com/nvm-sh/nvm"
		echo "		 php ⇒ http://jdem.cz/fgyu56 + https://deb.sury.org/"
		echo ""
		echo "Tips:"
		echo "	sudo update-alternatives --set php /usr/bin/php\$php"
		return 0
	fi
	if [ "$1" = "--save" ]; then
		shift
		rm -vi .jaaENV
		while test $# -gt 0
		do
			case "$1" in
				nodejs|node)
					local nodejs_version=`node --version`
					echo "nodejs=${nodejs_version:1}" >> .jaaENV
					;;
				gradle)
					local gradle_version=`gradle --version | head -n 3 | tail -n 1 | §awk 2`
					echo "gradle=$gradle_version" >> .jaaENV
					;;
				php)
					local php_version=`php --version | head -n 1 | §awk 2`
					echo "php=$php_version" >> .jaaENV
					;;
				*)
					echo "unknown '$1' – skipped"
					;;
			esac
			shift
		done
		return 0
	fi
	if [ "$1" = "--ls" ]; then
		echo ":: nvm ls ::\n"
		nvm ls
		echo ":: find /usr/bin/ -name php* ::\n"
		find /usr/bin/ -name php*
		echo ":: sdk ls gradle | cat :: "
		sdk ls gradle | cat
		return 0
	fi
	
	if [ -f "compose.yaml" ]; then
		jdk=$(grep -Po 'VERSION_JAVA=\K.*' compose.yaml)
		nodejs=$(grep -Po 'VERSION_NODEJS=\K.*' compose.yaml)
	else
		. ./.jaaENV
	fi
	if [ ! -z ${android_home+x} ]; then export ANDROID_HOME=$ANDROID_HOME_BAK; echo "\$ANDROID_HOME=$ANDROID_HOME"; else unset ANDROID_HOME; echo "\$ANDROID_SDK_ROOT=$ANDROID_SDK_ROOT"; fi
	if [ ! -z ${android_home_is_sdk+x} ]; then export ANDROID_HOME=$ANDROID_SDK_ROOT; echo "\$ANDROID_HOME=$ANDROID_HOME"; fi
	if [ ! -z ${jdk+x} ]; then
		if (( $(echo "$jdk > 9" | bc -l) )); then
			export JAVA_HOME_bk=$JAVA_HOME
			export JAVA_HOME=/snap/android-studio/current/android-studio/jre;
		elif [ ! -z ${JAVA_HOME_bk+x} ]; then
			export JAVA_HOME=$JAVA_HOME_bk
		fi
		echo "\$JAVA_HOME=$JAVA_HOME"
	fi
	if [ ! -z ${nodejs+x} ]; then nvm use $nodejs; fi
	if [ ! -z ${gradle+x} ]; then sdk use gradle $gradle | tr -d '\n'; echo ; fi
	if [ ! -z ${php+x} ];	 then
		local php_local=`php --version | head -n 1 | §awk 2`
		if [[ "$php_local" == "$php"* ]]; then
			echo "php $php"
		else
			echo "php $php ← $php_local"
			sudo update-alternatives --set php /usr/bin/php$php
			sudo -k
		fi
	fi
	unset android_home
	unset nodejs
	unset gradle
	unset php
}