While you can manually enter the commands to edit files in Terminal editors, in OS X you can set up a service to open files in a desired terminal editor from the Finder's contextual menu.

How to Execute a File in a MacBook Terminal. The operating system your MacBook runs, OS X, is built on top of UNIX, and Terminal provides you with access to the underlying UNIX system commands.

GNU Screen allows you to run multiple console applications within a single terminal window, and switch between them easily with the keyboard—but it gets even better: it also allows you to save ...