golang 按行读取文件

package main

import "fmt"
import "os"
import "io"
import "bufio"


func cat (r *bufio.Reader) {
    for {
        buf, err := r.ReadString('\n')
        if err == io.EOF {
            break
        }

        fmt.Println(buf)
    }
}

func main() {

    f, err := os.OpenFile("/proc/net/tcp", os.O_RDONLY, 0660)
    if err != nil {
        fmt.Println(err)
    }
    cat (bufio.NewReader(f))

    f.Close()
}