Golang : Send data to /dev/null a.k.a blackhole with ioutil.Discard

In Unix/Linux system administration, there are times when the system administrator needs to reduce the size of a file to 0 immediately. Such situation usually involves log files that had taken up all the available disk space and caused other running applications that need disk space to behave oddly.

This is usually done by pointing the Unix/Linux's "black hole" (/dev/null) to the offending file. Such as:

$cat /dev/null > somefile.log

or sending an application logs to /dev/null

In Golang, the ioutil.Discard variable is similar to /dev/null and we can use it to send unwanted log output or basically any unwanted data.

 package main

 import (

 func main() {

  log.Println("You can see this log message")

  // direct all log messages to /dev/null a.k.a Blackhole

  log.Println("But not this log message!")





  See also : Golang : Secure file deletion with wipe example

By Adam Ng(黃武俊)

IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.