line filters _ golang

A line filter is a common type of program that reads input on stdin, processes it, and then prints some derived result to stdout. grep and sed are common line filters

package main

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

func main() {

    scanner := bufio.NewScanner(os.Stdin)

    for scanner.Scan() {
        ucl := strings.ToUpper(scanner.Text())
        fmt.Println(ucl)
    }

    if err := scanner.Err(); err != nil {
        fmt.Fprintln(os.Stderr, "error:", err)
        os.Exit(1)
    }
}

jsjsksksjk
JSJSKSKSJK
hshfhfj
HSHFHFJ
^Cexit status 2

总结  ：

　　1 ： ......