read-file-per-lines.go

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

func main() {
    if len(os.Args) != 2 {
        fmt.Fprintln(os.Stderr, "Usage: go run main.go filename")
        os.Exit(1)
    }
    path := os.Args[1]

    doAnything(path)
}

func doAnything(path string) {

    fp, err := os.Open(path)
    if err != nil {
        panic(err)
    }

    scanner := bufio.NewScanner(fp)

    for scanner.Scan() {
        line := scanner.Text()
        fmt.Println(line)
    }
}