I can do Get Info on a file or folder but this gives the path of the containing folder not the target file or folder. Say I want to copy a full path into a file dialog; how can I do this?
You can drag the file or folder from Finder application to the dialog box. The full path of the file or folder will appear in the dialog box. Additionally, you can drag a file or folder into the Terminal application or many other apps, to expand the path.
You can also use the option+⌘+C key combination to copy the full path to the clip board. You can then paste this full path as text.
Also, if you enable showing the Path Bar in the Finder application, then you can drag any part of the full path to a dialog box. The Path Bar can be enabled by selecting
View➔Show Path Bar from the menu bar or by using the option+⌘+P key combination.