Example of atomic move for #ruby IRC

atomic_move.rb

require 'fileutils'
require 'tempfile'

def write_atomically(content, temp_name: 'temp.txt', atomic_path: 'atomic.txt')
  temp = Tempfile.new temp_name
  temp.write content
  temp.close

  FileUtils.mv temp.path, atomic_path
ensure
  temp.unlink
end

write_atomically 'foo'
write_atomically 'bar'

p File.read 'atomic.txt'
#=> "bar"