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.imporant", "/data/tmp") do |f| 

  file.write("hello")

end

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