Hello World Golang and Go tool
This tutorial demonstrates on how to develop a simple Go package and how to use the go tool (command go) to fetch, build and install Go packages and commands. In order to use go tool you need to organize your Go code (Please check Golang Project Structure ) in a specific way.
Source Repository and Base Path
Let’s say if you want to keep your code in some source repository like GitHub, then you should use the root of that source directory as your base path. For instance, if you have github account github.com/sneppets , then that is your base path.
Now use github.com/sneppets as your base path and create a directory inside your workspace where you want to keep the source code:
$ mkdir $GOPATH/src/github.com/sneppets
Hello World Golang
First create/choose a package path (let’s use github.com/sneppets/hello) and create corresponding package path in your workspace.
$ mkdir $GOPATH/src/github.com/sneppets/hello
Next create a file named hello.go inside that directory and write the following code
package main
import "fmt"
func main() {
fmt.Println("Hello, world.")
}
Using go tool
You can use go tool (command go) to build and install your hello world program. The below command finds the source code by looking for the package github.com/sneppets/hello inside the workspace specified by GOPATH.
$ go install github.com/sneppets/hello
You can also use go install command from the package directory
As a result this command builds hello command, producing an executable binary hello (in windows hello.exe)in the bin directory
Go commands
Now you can run the program by typing the following command
$ $GOPATH/bin/hello Hello, world.
If you have added $GOPATH/bin to your PATH, then you can just type the binary name from the command line like below
$ hello Hello, world.
Finally you can push the code to remote repository (GitHub in this case)
References
Recommended for you
How to create Golang project structure