[michaelmcmillan]

On MacOS you can also drag-and-drop a file from Finder onto your terminal and it will type out the full path for you.

[TheAceOfHearts]

You can also select one or more files and use the hotkey Command + Option + C to "Copy N items as Pathname", which copies the full pathname of each item to your clipboard.

[Tsiklon]

Wonderful! I didn't know that it was possible to copy the file path of an arbitrary selection, thanks!