How Can I Read Single Characters from Standard Input Instantly in Go?

Read Character from Standard Input Instantly in Go

In Go, reading from standard input typically requires pressing Enter to receive the input. However, if you want your application to respond immediately to any key press, similar to Console.ReadKey() in C#, the following solution can achieve that.

The provided code disables input buffering using stty commands, ensuring that keystrokes are processed instantly. Character echoing is also suppressed to prevent displayed input.

Here's the code:

package main

import (
    "fmt"
    "os"
    "os/exec"
)

func main() {
    // Disable input buffering
    exec.Command("stty", "-F", "/dev/tty", "cbreak", "min", "1").Run()
    // Suppress input echoing
    exec.Command("stty", "-F", "/dev/tty", "-echo").Run()

    var b []byte = make([]byte, 1)
    for {
        os.Stdin.Read(b)
        fmt.Println("I got the byte", b, "("+string(b)+")")
    }
}

When this code is running, pressing any key immediately returns the character byte representation and corresponding character to the console.

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