atomic_write(file_name, temp_dir = Dir.tmpdir) public

Write to a file atomically. Useful for situations where you don’t want other processes or threads to see half-written files. 

  File.atomic_write("important.file") do |file|
    file.write("hello")
  end

If your temp directory is not on the same filesystem as the file you’re trying to write, you can provide a different temporary directory. 

  File.atomic_write("/data/something.important", "/data/tmp") do |f|
    file.write("hello")
  end
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