Re:-

- and the Mac is Linux based -

I'm not a Mac user, but I am aware that their OS is BSD based, not Linux. https://en.wikipedia.org/wiki/Berkeley_Software_Distribution

Many of the command line tools are common as they are both "UNIX like".  But there are some significant differences in the behaviour of some, and how they interact.

As they say...   The Devil is in the Detail.   BSD is "more UNIX like" (I think is the phrase) than Linux.

73.

Dave G0WBX (G8KBV)