[LukeShu]

Sort of. While ed was scriptable, it was by sending the commands to stdin, which doesn't lend itself to being composed in a pipeline, where you'd more intuitively expect the text it's modifying to be on stdin. We can do it without problem now, because shells have process substitution, but ed predates that shell feature by a couple of decades. Instead, to use ed in pipelines, we ended up with a modified ed to work on streams: `sed`, the Stream ED.