An example of what you might do with the conditional shown in https://gist.github.com/tjluoma/4970335

islaunchd2.sh

#!/bin/zsh -f

NAME="$0:t"

PPID_NAME=$(/bin/ps -p $PPID | fgrep '/sbin/launchd' | awk '{print $NF}')

if [ "$PPID_NAME" = "/sbin/launchd" ] 
then		
		# This IS launchd, so send the message via growlnotify so it will be seen 
		
	msg () {
		growlnotify --message "$@" "$NAME"
	}

else
		# This is NOT via launchd, so send the message to stdout via 'echo'

	msg () {
		echo "$NAME: $@"
	}
fi

msg "Hello World"

exit 0
#EOF