open multiple files in one emacs window I can open a file in emacs with this command:

open -a Emacs main.cpp


But when I apply the same command to multiple files

open -a Emacs main.cpp test.cpp


two emacs windows will appear. I would like to open them
in the same emacs window, is this possible?
Instead of starting Emacs with open you can use emacsclient to send files to an already running Emacs. For this to work you need to start the corresponding server inside emacs by including

(server-start)


in your emacs init file.