Golang : Read a file line by line



Tags : golang read-file line-by-line

Got another newbie to Golang asking me for help today on how to read a file line by line. The simplest way that I can think of is to use the bufio.NewScanner() and scanner.Scan() functions. Below is a sample code for reading a text file line by line.

Content of file.dat

First

Second

Third

Fourth

Fifth

and the program will read the file

 package main

 import (
 "bufio"
 "fmt"
 "os"
 )

 func main() {
 file, err := os.Open("./file.dat")

 if err != nil {
 fmt.Println(err)
 os.Exit(1)
 }

 defer file.Close()

 reader := bufio.NewReader(file)
 scanner := bufio.NewScanner(reader)

 for scanner.Scan() {
 fmt.Println(scanner.Text())
 }

 }

and output the following

First

Second

Third

Fourth

Fifth

Reference :

bufio NewScanner function example

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  See also : Golang : Scanf function weird error in Windows



Tags : golang read-file line-by-line

By Adam Ng

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