What's the migration from homebrew/dupes to homebrew/core?

Question

I want to install screen, but what should I do next?

$ brew search screen
imgur-screenshot                                screen                                          screenfetch                                     screenresolution
caskroom/drivers/casio-screen-receiver          caskroom/cask/screen-blacker                    caskroom/cask/show-my-screen                    caskroom/cask/syphon-virtual-screen

If you meant "screen" specifically:
It was migrated from homebrew/dupes to homebrew/core.

Answer 1

homebrew/dupe is now deprecated all its formula have been migrated to the main repository (homebrew/core). As screen is now in homebrew/core, you just have to do:

brew install screen

but if you want you can install other third-party repositories (e.g. homebrew/science), called taps in the homebrew terminology, with:

brew tap homebrew/science

You can then directly installed all formulas in this tap. You can also install a formula from an uninstalled tap with:

brew install homebrew/science/<formula>

To list all your installed taps:

brew tap

To remove a tap:

brew untap homebrew/science