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# Cobra # Cobra
A Commander for modern go CLI interactions Cobra is both a library for creating powerful modern CLI applications as well as a program to generate applications and command files.
Many of the most widely used Go projects are built using Cobra including:
* [Kubernetes](http://kubernetes.io/)
* [Hugo](http://gohugo.io)
* [Rocket](https://github.com/coreos/rkt)
* [Docker (distribution)](https://github.com/docker/distribution)
* [OpenShift](https://www.openshift.com/)
* [Delve](https://github.com/derekparker/delve)
* [GopherJS](http://www.gopherjs.org/)
* [CochroachDB](http://www.cockroachlabs.com/)
* [Bleve](http://www.blevesearch.com/)
* [ProjectAtomic (enterprise)](http://www.projectatomic.io/)
* [Parse (CLI)](https://parse.com/)
[![Build Status](https://travis-ci.org/spf13/cobra.svg)](https://travis-ci.org/spf13/cobra) [![Build Status](https://travis-ci.org/spf13/cobra.svg)](https://travis-ci.org/spf13/cobra)
## Overview ## Overview
Cobra is a commander providing a simple interface to create powerful modern CLI Cobra is a library providing a simple interface to create powerful modern CLI
interfaces similar to git & go tools. In addition to providing an interface, Cobra interfaces similar to git & go tools.
simultaneously provides a controller to organize your application code.
Inspired by go, go-Commander, gh and subcommand, Cobra improves on these by Cobra is also an application that will generate your application scaffolding to rapidly
providing **fully posix compliant flags** (including short & long versions), develop a Cobra based application.
**nesting commands**, and the ability to **define your own help and usage** for any or
all commands. Cobra provides:
* Easy sub-command based CLIs: `app server`, `app fetch`, etc.
* Fully posix compliant flags (including short & long versions)
* Nested sub commands
* Global, local and cascading flags
* Easy generation of applications & commands with `cobra create appname` & `cobra add cmdname`
* Intelligent suggestions (`app srver`.. did you mean `app server`)
* Automatic help generation for commands and flags
* Automatic detailed help for `app help [command]`
* Automatic help flag recognition of `-h`, `--help`, etc.
* Automatically generated bash autocomplete for your application
* Automatically generated man pages for your application
* Command aliases so you can change things without breaking them
* The flexibilty to define your own help, usage, etc
* Optional tight integration with [viper](http://github.com/spf13/viper) for 12 factor apps
Cobra has an exceptionally clean interface and simple design without needless Cobra has an exceptionally clean interface and simple design without needless
constructors or initialization methods. constructors or initialization methods.