This is an example
to show how
to read file 
line by line.

Here is the program:

package main
import (
    "bufio"
    "fmt"
    "log"
    "os"
)
func main(){
    LinebyLineScan()
}
func LinebyLineScan() {
    file, err := os.Open("./sample.txt")
    if err != nil {
        log.Fatal(err)
    }
    defer file.Close()
    scanner := bufio.NewScanner(file)
    for scanner.Scan() {
        fmt.Println(scanner.Text())
    }
    if err := scanner.Err(); err != nil {
        log.Fatal(err)
    }
}

Output:

This is an example
to show how 
to read file 
line by line.

Note however bufio.Scanner has max buffer size 64*1024 bytes which means in case you file has any line greater than the size of 64*1024, then it will give the error

bufio.Scanner: token too long

The post Read a large file Line by Line in Go (Golang) appeared first on Welcome To Golang By Example.