Hello James,

for Mac users i found this info:
https://www.google.de/url?sa=t&source=web&rct=j&url=https://sites.google.com/site/randomprogrammingnotes/macosxsed&ved=0ahUKEwjUkNylpPDWAhVHnBoKHWddDSgQFgg2MAU&usg=AOvVaw07eLgmTJNNnW93uNHyZDdT

Karsten