Detect OS in Go (Golang)

runtime.GOOS constant can be used to detect the OS at runtime since this constant gets set only at runtime.

runtime.GOARCH can be used to know the architecture target of the running program.

To see all possible combinations of GOOS and GOARCH, run the command

go tool dist list

Below is the code to know the currently running OS:

package main

import (
    "fmt"
    "runtime"
)

func main() {
    os := runtime.GOOS
    switch os {
    case "windows":
        fmt.Println("Windows")
    case "darwin":
        fmt.Println("MAC operating system")
    case "linux":
        fmt.Println("Linux")
    default:
        fmt.Printf("%s.\n", os)
    }
}

Output:

Your current operating system