GNU Ed

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GNU Ed is an implementation of Ed. Other implementations of Ed.

Homepage: https://www.gnu.org/software/ed/

wp:ed_(software) (EDitor) is a line-oriented text editor. Even though it's usable as a plain editor, most of its uses are in text-filtering/modifying scripts. That's why e.g. GNU Sed exists—to supersede the outdated ed in text-oriented scripting.