How do I turn on color syntax highlighting in the macOS terminal app?

When I use terminal it is monochrome, currently "Grass" yellow on green. I've tried several ssh clients: MacOS default terminal, Termius, and Core Shell. They all have the same result, no syntax highlighting.

Did I do something to turn it off? How can I turn it on?

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Just have a look at this https://superuser.com/questions/400360/syntax-highlighting-in-terminal-mac-os-x post. In my view, it comes with a lot of useful hints.