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Writing Programs in Go

This chapter will talk about many essential, interesting, and handy Go topics that will help you be more productive. I think it would be a good idea to start this chapter by compiling and running the Go code of the hw.go program from the previous chapter. Then, you will learn how to deal with the environment variables that can be used by Go, how to process the command-line arguments of a Go program, and how to print the output on the screen and get input from the user. Finally, you will see how to define functions in Go, learn about the extremely important defer keyword, look at the data structures that come with Go, and learn what Go interfaces are before checking out code that generates random numbers.

Therefore, in this chapter, you will become familiar with many Go concepts, including the following:

Compiling your Go programs
Go environment variables...

Key benefits

- Learn how to write system's level code in Golang, similar to Unix/Linux systems code

- Ramp up in Go quickly

- Deep dive into Goroutines and Go concurrency to be able to take advantage of Go server-level constructs

Description

Go is the new systems programming language for Linux and Unix systems. It is also the language in which some of the most prominent cloud-level systems have been written, such as Docker. Where C programmers used to rule, Go programmers are in demand to write highly optimized systems programming code. Created by some of the original designers of C and Unix, Go expands the systems programmers toolkit and adds a mature, clear programming language. Traditional system applications become easier to write since pointers are not relevant and garbage collection has taken away the most problematic area for low-level systems code: memory management. This book opens up the world of high-performance Unix system applications to the beginning Go programmer. It does not get stuck on single systems or even system types, but tries to expand the original teachings from Unix system level programming to all types of servers, the cloud, and the web.

What you will learn

•Explore the Go language from the standpoint of a developer conversant with Unix, Linux, and so on

• Understand Goroutines, the lightweight threads used for systems and concurrent applications

• Learn how to translate Unix and Linux systems code in C to Golang code

• How to write fast and lightweight server code

• Dive into concurrency with Go

• Write low-level networking code

What do you get with Print?

Instant access to your digital eBook copy whilst your Print order is Shipped

Paperback book shipped to your preferred address

Download this book in EPUB and PDF formats

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Evaggelos Balaskas Oct 24, 2017

This book is a must have on your library!Initially I had my reservations about Go and this book (as I am not a developer/programmer), but after the first few chapters I was completely overturned by it!The author, without wasting any time -this is a not a beginners book-, immediately jumps to the point and you can really start writing Go code from the very first chapters. And this comes from a sysadmin who somehow was afraid to write any Go code before.It only took a few chapters playing with the code examples to see that. The chapters were enlightening and while reading the book I had the feeling that it was written for someone like me. Overall, this is a book of great quality, that you will use it again as a reference in the future.

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No name Oct 28, 2017

This is a very nice book for those who know basic programming and they want to learn systems programming but also for those who are programmers and they are interested in learning Go.There are many examples that help the understanding of basic Go concepts and the way that things are done in Go. It also explains the basics of Unix and system programming in Unix.

George Adamopoulos Oct 23, 2017

I really like Go. I am replacing C with it in most of my choices. The fact that it comes "batteries includes" and that it has endured the last 10 years helps. So I really needed a book that would allow me to view it more as a tool than just a language.This is such a book. This is a book where you already know some Go (i.e. you have read the tutorial that is available at gopl.io). But it is also a book that is not self-contained, in that if you do know know enough Go, you need to use your web browser a lot. For example to lookup more stuff about reflections. Or some other packages that get imported.It is clear that the author did not intend to write yet another introduction to Go. The target audience is people who armed with a terminal and an editor are more interested in tooling. Stuff that in the "old days" you would decide to write in C. Now here is a path to write them in Go. This is the great achievement of the book. You go through it section by section and if you have any significant systems programming experience with C, you feel the relevance: "I've done this in C before! So that's how you do it in Go". And it is not about C. Scripting in any of your language of choice can at times be done in Go also.If you do not have time pressure, the sections are small enough that you can work one or two of them per day. That would be a slow progress, but it would also be a 10 minute per day plan.To learn Go, I would go through and introduction to the language (among the numerous ones available), then work this book and finally keep the GoPL at bay for reference.There have been typos which I have submitted to the author of the book and I read it on O'Reilly's Safari

Ranx0r0x Jun 15, 2018

The book starts with a rather obtuse and scattershot introduction to Go. Not enough to actually learn Go programming so it isn't a tutorial but it isn't terribly useful.The book doesn't really start until getting into File and processes and then it ends to quickly with a web applications section that seems tacked on. It isn't that any of it is particularly bad but if it is going to be a "Systems Programming" book then it should focus on systems programming and not programming basics of pointers, structs, installation, version numbers and the like and swerve sharply later into setting up a web server with database back end.

Greg Nov 26, 2017

Easy start but even tho the author included a lot of code and commands I had to google a lot in order to follow along with the examples. Maybe his compile command does work but because the book's formatting is off, I had to google for it. Plus, the author omits saying in the text what the following commands will do so he missed his chance to clarify things.

Go Systems Programming: Master Linux and Unix system level programming with Go

What do you get with Print?

Go Systems Programming

Writing Programs in Go

Compiling Go code

Go environment variables

Using command-line arguments

User input and output

Getting user input

Go functions

Go data structures

Arrays

Interfaces

Creating random numbers

Exercises

Summary

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