LOGGER IN r，R

Question

我是R语言的初学者， 虽然我必须在R中编辑一些预先编写的代码。 有一个我不明白的具体问题。 如果有人可以帮助我理解这一点，将非常有帮助。

# Logger
log.msg = function(msg){
  ## capture messages and errors to a file.
  fileConn<-file("output.txt", open = "a+")
  writeLines(c(msg), fileConn)
  close(fileConn)
}

 log.msg("Start Data extraction and merging..")

Answer 1

log.msg = function(msg){
  ## capture messages and errors to a file.

  ## create file connection in append mode (a+)
  fileConn<-file("output.txt", open = "a+")

  ## write the msg to this file
  writeLines(c(msg), fileConn)

  ## close connection
  close(fileConn)
}