In this tutorial, I will show how you can use Cobra to build CLI applications in Go and highlight some of its key features and benefits. I will do this by walking you through the process of building a CLI that encrypts and decrypts text based on a specified cipher.

ff stands for flags-first, and provides an opinionated way to populate a flag.FlagSet with configuration data from the environment. By default, it parses only from the command line, but you can enable parsing from environment variables (lower priority) and/or a configuration file (lowest priority).

Building a commandline application in the style of kubectl or docker? Consider package ffcli, a natural companion to, and extension of, package ff.

Go is generally considered a ‘simple’ language, but it has more edge cases and tricks than most might expect.

grpcurl is a command-line tool that lets you interact with gRPC servers. It's basically curl for gRPC servers.

The new log/slog package in Go 1.21 brings structured logging to the standard library. Structured logs use key-value pairs so they can be parsed, filtered, searched, and analyzed quickly and reliably. For servers, logging is an important way for developers to observe the detailed behavior of the system, and often the first place they go to debug it. Logs therefore tend to be voluminous, and the ability to search and filter them quickly is essential.

Learn how to use Go's singleflight and errgroup packages, and other important design patterns for concurrency, with real-world examples.

Alex shares his insights from building half a dozen popular Go CLIs. Which can you apply to your projects?

Is your project's CLI growing with you? I'll cover some of the lessons learned writing the OpenFaaS, actuated, actions-usage, arkade and k3sup CLIs, going as far back as 2016. I hope you'll find some ideas or inspiration for your own projects - either to start them off, or to improve them as you go along.

Cgo calls take about 40ns, about the same time encoding/json takes to parse a single digit integer. On my 20 core machine Cgo call performance scales with core count up to about 16 cores, after which some known contention issues slow things down.

Profile-Guided Optimization (PGO) is an optimization method which improves final compiled binary by using profile data hints and compiling the code based on those profiles.

Goquery for Golang is one of the most popular scraping libraries. This complete HTTP parser provides a jQuery-like syntax to traverse the DOM and extract the data of interest from it. In this tutorial, you'll first dig into the basics and then explore more advanced scenarios through examples.

In this article, we will discuss the Redis data structures that can be employed to build messaging solutions, each illustrated with a sample application written in Go.

"CLI Mate" autogenerates CLIs from structs / functions (nested subcommands, global / local flags, help generation, typo suggestions, shell completion etc.)

This article aims to uncover some insights that should help you clarify that question by taking a look at eight logging solutions, discussing their pros and cons after considering the following factors: performance, flexibility, features, ease of use, and community support.