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wtf is cli?

urfave/cli — explained in plain English

Analysis updated 2026-06-21

★ 24,018GoAudience · developerComplexity · 2/5Setup · easy

TL;DR

urfave/cli is a Go library that makes it easy to build command-line tools with flags, subcommands, and auto-generated help text, with no external dependencies beyond Go's standard library.

Mindmap

mindmap
  root((repo))
    What it does
      CLI app builder
      Flag handling
      Auto help text
    Features
      Subcommands
      Shell autocomplete
      Config file support
    Use Cases
      Dev tools in Go
      Automation scripts
      System utilities
    Tech Stack
      Go only
      No dependencies
    Audience
      Go developers
      Tool builders

Code map

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filefunction / class

Why would anyone build with this?

REASON 1

Build a Go command-line tool with multiple subcommands, similar to how git has commit, push, and pull as separate commands.

REASON 2

Add flags and environment variable support to a Go CLI program with automatic help text generation included.

REASON 3

Create a developer automation script in Go that reads options from the command line, environment variables, or a config file.

What's in the stack?

Go

How it stacks up

urfave/clicharmbracelet/crushcilium/cilium
Stars24,01823,93024,286
LanguageGoGoGo
Setup difficultyeasymoderatehard
Complexity2/53/54/5
Audiencedeveloperdeveloperops devops

Figures from each repo's GitHub metadata at analysis time.

How do you spin it up?

Difficulty · easy Time to first run · 30min

Pure Go with no external dependencies, just add it to your go.mod file.

Wtf does this do

urfave/cli is a Go library for building command-line tools. The problem it solves is that writing a proper CLI application from scratch, handling flags, subcommands, help text, and configuration, involves a lot of boilerplate code. This library lets you describe your command structure declaratively, meaning you define what your tool does and the library handles the plumbing. Key features include support for commands and subcommands (like how "git commit" and "git push" are subcommands of "git"), automatic help text generation, shell auto-completion for bash, zsh, fish, and PowerShell, and flexible flag handling. Flags, the options you pass to a command, like "--verbose" or "-n 5", can be read from the command line, from environment variables, or from configuration files. The library has no external dependencies beyond Go's own standard library, keeping it lightweight. You would use this when building any Go program that is meant to be run from a terminal, such as developer tools, automation scripts, or system utilities. It is well-suited for projects that need a clean, structured CLI with multiple commands and options.

Yoink these prompts

Prompt 1
Using urfave/cli in Go, write a CLI tool with two subcommands: one that uploads a file and one that downloads a file, each with their own flags.
Prompt 2
Show me how to add shell autocomplete support to my urfave/cli Go app for both bash and zsh users.
Prompt 3
Write a Go CLI app with urfave/cli that reads a --config flag falling back to a CONFIG env variable, with a default value if neither is set.
Prompt 4
How do I use urfave/cli to build a subcommand that accepts positional arguments alongside optional flags in Go?

Frequently asked questions

wtf is cli?

urfave/cli is a Go library that makes it easy to build command-line tools with flags, subcommands, and auto-generated help text, with no external dependencies beyond Go's standard library.

What language is cli written in?

Mainly Go. The stack also includes Go.

How hard is cli to set up?

Setup difficulty is rated easy, with roughly 30min to a first successful run.

Who is cli for?

Mainly developer.

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