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I am creating Go snippet to write log into a file using os module, You can use the writing into the file feature for logging, saving data, store data in file etc. In our example, we set the log file (log. Use the log.SetOutput () method to define the destination where messages will be logged. You can read data from a file or write something into the file using golang os package. To log to a log file, we first need to create a log file with the correct permissions. It implements both io.Reader and io.Writer and, therefore, can be used in any streaming IO contexts. After opening the CSV file, we will handle functionality to write to the CSV. Create CSV File Write Data to CSV File Create CSV File We will create the CSV file using os package from Go. First, we need to create the file for writing using the os package. Go is providing os package to create/read/write the file. Type os.File represents a file on the local system. We will be able to write a CSV file in the same way we read the file. The read and write files are very important features of any programming language. This golang tutorial help to read and write file using Golang.