Appending Newline to File Ends with Ruby

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I recently took over managing some config files from my dev colleagues. I was extremely annoyed to be reminded that Notepad (Windows’ text editor) does 2 major Unix-incompatible things:

  1. CRLF line ending (\r\n and not \n)
  2. No newline at the end of file, which is something of a nicety to help process files (allows you to assume each line ends with \n).
    We can see vim complaigining about it:

    And git too:

Issue 1 is easily solved with dos2unix, like this:

find -not -path '*/.git/*' -type f | xargs dos2unix

Issue 2 is a little bit more challenging, and I wrote this ruby oneliner for it:


Works nicely.