Book Image

Go Systems Programming

Book Image

Go Systems Programming

Overview of this book

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.
Table of Contents (13 chapters)

File I/O operations

Now that you know the basics of the io and bufio packages, it is time to learn more detailed information about their usage and how they can help you work with files. But first, we will talk about the fmt.Fprintf() function.

Writing to files using fmt.Fprintf()

The use of the fmt.Fprintf() function allows you to write formatted text to files in a way that is similar to the way the fmt.Printf() function works. Note that fmt.Fprintf() can write to any io.Writer interface and that our files will satisfy the io.Writer interface.

The Go code that illustrates the use of fmt.Fprintf() can be found in fmtF.go, which will be presented in three parts. The first part is the expected preamble:

package main 
 
import...