How to Read from Standard Input (stdin) in Go?

How to Read from Initial stdin in Go

In Go, reading from the initial stdin of a program can be achieved using the os.Stdin interface. However, if there is no input in os.Stdin, the program will wait for input.

Solution:

The recommended approach is to use os.Stdin as it provides a simple and reliable method for reading from the original stdin. To use os.Stdin, simply call the io.ReadAll() function to read all the bytes from the input.

Here's an example:

package main

import "os"
import "log"
import "io"

func main() {
    bytes, err := io.ReadAll(os.Stdin)

    log.Println(err, string(bytes))
}

When executed with echo test stdin | go run stdin.go, this code will print test stdin.

For line-based reading, the bufio.Scanner can be used:

import "os"
import "log"
import "bufio"

func main() {
    s := bufio.NewScanner(os.Stdin)
    for s.Scan() {
        log.Println("line", s.Text())
    }
}

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