How to Read from stdin in Go

Use bufio.NewScanner(os.Stdin) to read input line-by-line from standard input.

package main

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

func main() {
	scanner := bufio.NewScanner(os.Stdin)
	for scanner.Scan() {
		fmt.Println(scanner.Text())
	}
	if err := scanner.Err(); err != nil {
		fmt.Fprintln(os.Stderr, "error:", err)
	}
}

Reading from stdin in Go creates a scanner that reads text from the keyboard or a pipe one line at a time. It loops through each line you type until you signal the end of input (usually by pressing Ctrl+D on Mac/Linux or Ctrl+Z on Windows). Think of it like a conveyor belt that picks up each line of text you provide and hands it to your program to process.