How to write DOS line endings to a file from Unix

There's an option for this, the same one you're using on encode also works with File.open:

File.open('/tmp/foo', mode: 'w', crlf_newline: true) do |file|  file.puts("alpha")  file.puts("beta")end

This option not only ends lines in \r\n, it also translates any explicit \n into \r\n. So this:

file.puts("alpha\nbar")

will write alpha\r\nbar\r\b

CodeHunter