Go: "stat hello.go: no such file or directory" - macos

Question

Just installed Go on Mac OS X, Yosemite Version 10.10.3, as explained in the Getting Started page of the official website:
Mac OS X package installer
Download the package file, open it, and follow the prompts to install
the Go tools. The package installs the Go distribution to
/usr/local/go.
The package should put the /usr/local/go/bin directory in your PATH
environment variable. You may need to restart any open Terminal
sessions for the change to take effect.
I am now in the Test your installation section, which states:
Check that Go is installed correctly by building a simple program, as
follows.
Create a file named hello.go and put the following program in it:
package main
import "fmt"
func main() {
fmt.Printf("hello, world\n") }
Then run it with the go tool:
$ go run hello.go
hello, world
If you see the "hello, world" message then your Go installation is
working.
So, I created a hello.go file and, since I could not (ie: did not know how to) access the /usr/local/go/bin directory, I saved it on my desktop.
Obviously, I got the following error message:
stat hello.go: no such file or directory
So, where should I save my Go files to be able to run them?
UPDATE: after some research, I stumbled upond this video, explaining how to set the GOPATH.
If I want my Go workspace to be in user/code/go, how should I write my export GOPATH= command?

Answer 1

if your are using docker compose up/down to build image. You need to run
docker compose build
after changes in Dockerfile.

Answer 2

In my case, it was as simple as right clicking the file, and then clicking 'open in integrated terminal.' Then, to run your file type 'go run filename.go'

Answer 3

The GOPATH and PATH environment variables
The GOPATH environment variable specifies the location of your workspace. It defaults to a directory named go inside your home directory ($HOME/go).
If you really want to change your GOPATH to something else add GOPATH to your shell/bash/zsh initialization file .bash_profile, .bashrc or .zshrc.
export GOPATH=/something-else
Add GOPATH/bin directory to your PATH environment variable so you can run Go programs anywhere.
export PATH=$PATH:$(go env GOPATH)/bin

Answer 4

Following the explanation of Andrew Gerrand in Writing, building, installing, and testing Go code, I configured my Go workspace as follows:
1. Create workspace
First, since I want my Go code to be in my_user_name/code/go, I started by creating the corresponding folder:
$ cd code
$ mkdir go
2. Setup GOPATH
Then I configured the GOPATH:
$ cd
$ export GOPATH=$HOME/code/go
$ cd code/go
3. Add files to workspace
Last, I manually (through the Finder) moved my hello.go file into the workspace and ran:
$ go run hello.go
Worked like a charm.