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This was my post to alt.folklore.computers. Nice to see it reappear after all these years!

• astrodust 10y ago
  Did Elvis miss the cut? https://en.wikipedia.org/wiki/Elvis_(text_editor) https://en.wikipedia.org/wiki/Elvis_(text_editor)
  • enf 10y ago
    I didn't include it, because the original question was where vi and its predecessors came from, not what offspring did it have itself.
• beerbajay 10y ago
  Is the source history of these editors saved in the UNIX history GitHub project[1]? Is there significant code overlap or is your diagram more along the lines of inspired-by relationships? [1] https://github.com/dspinellis/unix-history-repo https://github.com/dspinellis/unix-history-repo
  • enf 10y ago
    There is not a lot of code overlap in most cases, even between ed and ex. The relationships are generally more about command sets than direct forking of code.