Book Image

Mastering Go - Second Edition

By : Mihalis Tsoukalos
Book Image

Mastering Go - Second Edition

By: Mihalis Tsoukalos

Overview of this book

Often referred to (incorrectly) as Golang, Go is the high-performance systems language of the future. Mastering Go, Second Edition helps you become a productive expert Go programmer, building and improving on the groundbreaking first edition. Mastering Go, Second Edition shows how to put Go to work on real production systems. For programmers who already know the Go language basics, this book provides examples, patterns, and clear explanations to help you deeply understand Go’s capabilities and apply them in your programming work. The book covers the nuances of Go, with in-depth guides on types and structures, packages, concurrency, network programming, compiler design, optimization, and more. Each chapter ends with exercises and resources to fully embed your new knowledge. This second edition includes a completely new chapter on machine learning in Go, guiding you from the foundation statistics techniques through simple regression and clustering to classification, neural networks, and anomaly detection. Other chapters are expanded to cover using Go with Docker and Kubernetes, Git, WebAssembly, JSON, and more. If you take the Go programming language seriously, the second edition of this book is an essential guide on expert techniques.
Table of Contents (20 chapters)
Title Page

The nc(1) command-line utility

The nc(1) utility, which is also called netcat(1), comes in very handy when you want to test TCP/IP servers and clients. This section will present some of its more common uses.

You can use nc(1) as a client for a TCP service that runs on a machine with the IP address and listens to port number 1234, as follows:

$ nc 1234

By default, nc(1) uses the TCP protocol. However, if you execute nc(1) with the -u flag, then nc(1) will use the UDP protocol.

The -l option tells netcat(1) to act as a server, which means that netcat(1) will start listening for connections at the given port number.

Finally, the -v and -vv options tell netcat(1) to generate verbose output, which can come in handy when you want to troubleshoot network connections.

Although netcat(1) can help you to test HTTP applications, it will be niftier in Chapter 13...