Ed is a text editor software that focuses on line editing capabilities.
Ed is known as the `standard' text editor because it was the original editor for Unix, which means it's widely available. However, for most purposes, it has been superseded by full-screen editors like Emacs.
Ed is a GNU software and it's an 8-bit clean, POSIX-compliant line editor. You can find extensions to and deviations from the POSIX in the file `POSIX'. If you're interested in learning more about the Ed algorithm, you can refer to Kernighan and Plauger's book "Software Tools in Pascal," which was published by Addison-Wesley in 1981.
Overall, for those who need a simple text editor that can get the job done, Ed is a solid option to consider.
Version 0.2: N/A