gobyexample/linefilter/linefilter.go

package linefilter

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

func LineFilter() {
	sc := bufio.NewScanner(os.Stdin)

	for sc.Scan() {
		cap := strings.ToUpper(sc.Text())
		fmt.Println(cap)
	}

	if err := sc.Err(); err != nil {
		panic(err)
	}
}