How can I read from standard input in the console?

You can as well try:

scanner := bufio.NewScanner(os.Stdin)
for scanner.Scan() {
    fmt.Println(scanner.Text())
}

if scanner.Err() != nil {
    // Handle error.
}

I think a more standard way to do this would be:

package main

import "fmt"

func main() {
    fmt.Print("Enter text: ")
    var input string
    fmt.Scanln(&input)
    fmt.Print(input)
}

Take a look at the scan godoc: http://godoc.org/fmt#Scan

Scan scans text read from standard input, storing successive space-separated values into successive arguments. Newlines count as space.

Scanln is similar to Scan, but stops scanning at a newline and after the final item there must be a newline or EOF.

Always try to use the bufio.NewScanner for collecting input from the console. As others mentioned, there are multiple ways to do the job, but Scanner is originally intended to do the job. Dave Cheney explains why you should use Scanner instead of bufio.Reader's ReadLine.

https://web.archive.org/web/20190508023954/https://twitter.com/davecheney/status/604837853344989184

Here is the code snippet answer for your question

package main

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

/*
 Three ways of taking input
   1. fmt.Scanln(&input)
   2. reader.ReadString()
   3. scanner.Scan()

   Here we recommend using bufio.NewScanner
*/

func main() {
    // To create dynamic array
    arr := make([]string, 0)
    scanner := bufio.NewScanner(os.Stdin)
    for {
        fmt.Print("Enter Text: ")
        // Scans a line from Stdin(Console)
        scanner.Scan()
        // Holds the string that scanned
        text := scanner.Text()
        if len(text) != 0 {
            fmt.Println(text)
            arr = append(arr, text)
        } else {
            break
        }

    }
    // Use collected inputs
    fmt.Println(arr)
}

If you don't want to programmatically collect the inputs, just add these lines

   scanner := bufio.NewScanner(os.Stdin)
   scanner.Scan()
   text := scanner.Text()
   fmt.Println(text)

The output of above program will be:

Enter Text: Bob
Bob
Enter Text: Alice
Alice
Enter Text:
[Bob Alice]

The above program collects the user input and saves them to an array. We can also break that flow with a special character. Scanner provides API for advanced usage like splitting using a custom function, etc., scanning different types of I/O streams (standard Stdin, String), etc.

Edit: The tweet linked in original post is not accesible. But, one can find official reference of using Scanner from this standard library documentation: https://pkg.go.dev/[email protected]#example-Scanner-Lines

Another way to read multiple inputs within a loop which can handle an input with spaces:

package main
import (
    "fmt"
    "bufio"
    "os"
)

func main() {
    scanner := bufio.NewScanner(os.Stdin)
    var text string
    for text != "q" {  // break the loop if text == "q"
        fmt.Print("Enter your text: ")
        scanner.Scan()
        text = scanner.Text()
        if text != "q" {
            fmt.Println("Your text was: ", text)
        }
    }
}

Output:

Enter your text: Hello world!
Your text was:  Hello world!
Enter your text: Go is awesome!
Your text was:  Go is awesome!
Enter your text: q

I'm late to the party. But how about one liner:

data, err := io.ReadAll(os.Stdin)

And press ctrl+d once done.

It can also be done like this:

package main
import "fmt"

func main(){
    var myname string
    fmt.Scanf("%s", &myname)
    fmt.Println("Hello", myname)
}

Cleanly read in a couple of prompted values:

// Create a single reader which can be called multiple times
reader := bufio.NewReader(os.Stdin)
// Prompt and read
fmt.Print("Enter text: ")
text, _ := reader.ReadString('\n')
fmt.Print("Enter More text: ")
text2, _ := reader.ReadString('\n')
// Trim whitespace and print
fmt.Printf("Text1: \"%s\", Text2: \"%s\"\n",
    strings.TrimSpace(text), strings.TrimSpace(text2))

Here's a run:

Enter text: Jim
Enter More text: Susie
Text1: "Jim", Text2: "Susie"

Try this code:

var input string
func main() {
    fmt.Print("Enter Your Name=")
    fmt.Scanf("%s", &input)
    fmt.Println("Hello " + input)
}

You need to provide a pointer to the variable you want to scan, like so:

fmt.scan(&text2)

In my case, the program was not waiting because I was using the watcher command to auto run the program. Manually running the program go run main.go resulted in "Enter text" and eventually printing to the console.

fmt.Print("Enter text: ")
var input string
fmt.Scanln(&input)
fmt.Print(input)

Let's do it very simple

s:=""
b := make([]byte, 1)
for os.Stdin.Read(b) ; b[0]!='\n'; os.Stdin.Read(b) {
    s+=string(b)
}
fmt.Println(s)

Here's the sane way of reading more than 1024 characters from the terminal. As-is it won't work with pipes and error, you can also opt to read using other methods (such as reading with bufio.Scanner or io.ReadAll) in that case.

package main

import (
    "fmt"
    "os"

    "golang.org/x/term"
)

func readLine() (string, error) {
    if !term.IsTerminal(int(os.Stdin.Fd())) {
        return "", fmt.Errorf("pipe not supported")
    }

    oldState, err := term.MakeRaw(int(os.Stdin.Fd()))
    if err != nil {
        return "", fmt.Errorf("failed setting stdin to raw mode: %w", err)
    }
    tty := term.NewTerminal(os.Stdin, "")
    line, err := tty.ReadLine()
    _ = term.Restore(int(os.Stdin.Fd()), oldState)

    if err != nil {
        return "", fmt.Errorf("failed to read from stdin: %w", err)
    }
    return line, nil
}

func main() {
    fmt.Println("Enter your line:")
    line, err := readLine()
    if err != nil {
        panic(err)
    }
    fmt.Printf("Your line was %d characters: %q\n", len(line), line)
}