I use sam -d. It's fairly similar to ed if you are familiar with it, the main differences are the expanded command language, better interface with *nix environm

I use sam -d. It's fairly similar to ed if you are familiar with it, the main differences are the expanded command language, better interface with *nix environments and allowing dot to include newlines, thus having commands work across lines. In windowed sam dot is the currently highlighted text and you have a snarf, cut and paste editor along with a separate window for commands.