Go is an open-source (BSD license) programming language that was born with the objective of allowing the creation of efficient and easily distributable applications. So, it has binaries for Windows, Mac OS, and of course, for Linux.

Install Go programming language on OpenSUSE 15.2

As I mentioned before, OpenSUSE provides great support for different popular languages through a dedicated repository. This repository is not activated but it is very easy to do.

With this repository, we will get recent versions of many programming languages and among them Go.

So, open a terminal and run the following command:

sudo zypper -ar https://download.opensuse.org/repositories/devel:/languages:/go/openSUSE_Leap_15.2/ devel

OpenSUSE manages the repositories according to the priority they have. The lower the first one is, So the newly added repository has to be reprioritized.

sudo zypper mr -p 70 devel

This ensures that we will always get updates from this repository. Now we have to refresh Zypper’s cache to accept the repository’s GPG key.

sudo zypper refresh
Retrieving repository 'devel' metadata -------------------------------------------------------------------------------------------------------------------------------[/]
New repository or package signing key received:
Repository: devel
Key Name: devel:languages:go OBS Project
Key Fingerprint: B619E7E2 4D0ED061 FA14343C AF4CFE4D 307D7BF9
Key Created: Wed Jun 3 00:52:51 2020
Key Expires: Fri Aug 12 00:52:51 2022
Rpm Name: gpg-pubkey-307d7bf9-5ed72ca3
Do you want to reject the key, trust temporarily, or trust always? r/t/a/?:

Later we can install Go. At the time of writing is the post the last stable version is 1.15.2

sudo zypper in go1.15
Loading repository data…
Reading installed packages…
Resolving package dependencies…
The following 17 NEW packages are going to be installed:
gcc gcc7 glibc-devel go1.15 go1.15-doc go1.15-race libasan4 libatomic1 libcilkrts5 libgomp1 libitm1 liblsan0 libmpx2 libmpxwrappers2 libtsan0 libubsan0
linux-glibc-devel
The following recommended package was automatically selected:
go1.15-doc
17 new packages to install.
Overall download size: 141.7 MiB. Already cached: 0 B. After the operation, additional 614.1 MiB will be used.
Continue? y/n/v/…? shows all options:

Now we can check the operation of the command Go, showing the installed version.

go version
go version go1.15.2 linux/amd64

Now we will create the first program.

The Hello World on Go

The first thing we have to do is create a folder for all our projects with Go. This folder can be in any location.

mkdir go_projects

The following is to add some environment variables to the system configuration. To do this, you must edit the file /etc/profile and add the following lines:

export GOPATH=$HOME/go_projects
export GOBIN=$GOPATH/bin

Replace the value of GOPATH with the path of the folder created for Go projects.

Save the changes and close the editor.

To create the first program, we have to create inside the project folder a folder called src and inside another folder with the name of our program.

For example:

mkdir -p ~/go_projects/src/first_program

Now access your program folder. In this case, it is “first_program“.

cd ~/go_projects/src/first_program

And create the source file with extension go.

nano ~/go_projects/src/first_program/helloworld.go

And start creating code. In our test case, we’ll just do a hello world.

package main
import "fmt"
func main() {
fmt.Printf("Welcome To 2daygeek\n")
}

Save the changes and close the editor.

Now compile the program:

go build first_program
go install first_program

This will generate a binary that we can execute:

./first_program

Output:

Welcome Osradar

And this way it is possible to get Go on OpenSUSE 15.2

Conclusion

GO is a very popular language and every day it is more and more popular. It’s simple but very powerful, besides being open source. As you have seen, its installation is really simple.

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Go is an open source (BSD license) programming language that was born with the objective of allowing the creation of efficient and easily distributable applications. So, it has binaries for Windows, Mac OS and of course, for Linux.

One of the main features of Go is the efficiency with which it manages computer resources. To the extent that many claims to be the natural replacement of C.

On the other hand, Go is a compiled language and has a garbage collector that tries to reduce the latency to the minimum guaranteeing optimal performance.

For this and many other reasons is that more and more developers have it as their main language.

Install Go language on FreeBSD 12

One of the main advantages of FreeBSD is that it has a large number of packages available from the official repositories. However, not all of them are up-to-date.

So in this post, we will download and install the latest stable version of Go which is 1.14.

First, open a terminal session. Once you have it open, you need to install curl to download Go.

:~$ sudo pkg install curl
Updating FreeBSD repository catalogue...
FreeBSD repository is up to date.
All repositories are up to date.
The following 2 package(s) will be affected (of 0 checked):
New packages to be INSTALLED:
	curl: 7.67.0
	ca_root_nss: 3.50
Number of packages to be installed: 2
The process will require 4 MiB more space.
1 MiB to be downloaded.
Proceed with this action? [y/N]: y

Once you have installed curl, we can start the download of Go with the following command:

:~$ curl https://dl.google.com/go/go1.14.freebsd-amd64.tar.gz --output go.tar.gz

When the download is finished we have to unzip it and move it to the /usr/local/ directory

:~$ tar xvf go.tar.gz
:~$ sudo mv go /usr/local

Go is ready for action, but it is convenient to make it available globally in our terminal. To do this, you have to edit the profile file.

:~$ sudo nano ~/.profile

And add the following content at the end:

export GOROOT=/usr/local/go 
export GOPATH=$HOME/work/
export PATH=$GOPATH/bin:$GOROOT/bin:$PATH

I’ll explain something quickly. The second line refers to a folder called “work” in that folder is where we have to include all our Go projects. Of course, you can replace the name “work” with whatever you want.

Save the changes and close the file.

Now you can see the version of Go installed with the following command:

:~$ go version
go version go1.14 freebsd/amd64

This indicates that Go is available from the console no matter where the prompt is located.

Testing Go

Now that Go is installed, let’s do the classic Hello World program to check that everything is okay.

First, we’ll create the project folders. Remember that it will be inside the work folder. Inside it, the project folder and inside it, the src folder where we will create the source file.

:~$ mkdir -p $HOME/work/src/hello

Then, create the source file and add the following content

:~$ nano ~/work/src/hello/hello.go
package main 
 import "fmt"
 func main() {
 fmt.Printf("hello, world\n")
 }

Finally, we build the project, compile the source code and execute it:

:~$ go build hello
:~$ go install hello
:~$ hello
hello, world

So, Go is ready to use.

Conclusion

There are many programming languages but there is always room for innovation and that is what Go gives us. An efficient language and with the support of a giant like Google.

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In the past, we’ve talked about GO. GO is a programming language that is becoming increasingly popular among developers and sysadmin. Initially, it was created by Google but has been expanding to be used by many current developers. It is inspired by C++ and has binaries for Windows, Linux and Mac OS. It is also open source under the BSD license.

1.- Upgrade the system

First of all, it is necessary to make a complete update to the system. For this, run the following command:

:~$ su
:~# yum update

The main objective of this is to make your system have the latest security patches available. This way it will be more stable and you will be ready to continue with the process.

2.- Download and install GO

CentOS 7 is a 64-bit system, so we will download the corresponding binaries using wget. If you do not have it installed, do it first.

:~# yum install wget
:~# wget https://dl.google.com/go/go1.11.5.linux-amd64.tar.gz

At the time of writing this post, the latest stable version of GO is 1.11.5. Check the GO website for the latest version.

After doing this, it is necessary to unzip the downloaded folder. We will do it in the /usr/local directory.

:~# tar -zxvf go1.11.5.linux-amd64.tar.gz -C /usr/local

So that the installation does not have problems. It is necessary to define environment variables. I mean GOROOT and PATH.

:~# echo 'export GOROOT=/usr/local/go' | tee -a /etc/profile
:~# echo 'export PATH=$PATH:/usr/local/go/bin' | tee -a /etc/profile

Finally, refresh your bash profile.

:~# source /etc/profile

So, test GO.

3.- Test the installation

To verify that the installation has been correct, it is first necessary to show the version of GO. To do it, run this command:

:~# go version
:~# go env

However, the best way to check if your GO is correctly installed is to make a program and run it.

First, create a folder where the program will be located.

:~# mkdir -p src/test
:~# cd src/test

Next, create the file. I will name it test.go.

:~# nano test.go

And add the following:

package main
import "fmt"
func main() {
    fmt.Printf("Hi, I am Angelo. Thanks for visit Osradar\n")
}

Finally, run the file.

:~# go run test.go

So, GO is ready for the action.

Conclusion

Learning to program using GO is a good idea these days. The project is quite mature and more and more people are interested in this language. Installing GO on CentOS 7 is not complicated at all.

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