Go CLI application, tool library, running CLI commands, support console color, user interaction, progress display, data formatting display, generate bash/zsh completion add more features.

Programming language: Go
License: MIT License
Tags: Command Line     Standard CLI     Tools     CLI     Console    
Latest version: v2.3.4

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A simple to use command line application, written using golang.

Since v2.3.0, option binding and argument binding have been reconstructed, which may be incompatible with the previous ones.


中文说明请看 [README.zh-CN](README.zh-CN.md)




  • Simple to use
  • Support for adding multiple commands and supporting command aliases
  • option/flag Support option binding --long, support for adding short options(-s)
    • POSIX-style short flag combining (-a -b = -ab)
    • Support setting Required, indicating a required option parameter
    • Support setting Validator, which can customize the validation input parameters
  • argument Support binding argument to specify name
    • Support required, optional, array settings
    • It will be automatically detected and collected when the command is run.
  • colorable Supports rich color output. provide by gookit/color
    • Supports html tab-style color rendering, compatible with Windows
    • Built-in info, error, success, danger and other styles, can be used directly
  • interact Built-in user interaction methods: ReadLine, Confirm, Select, MultiSelect ...
  • progress Built-in progress display methods: Txt, Bar, Loading, RoundTrip, DynamicText ...
  • Automatically generate command help information and support color display
  • When the command entered is incorrect, a similar command will be prompted(including an alias prompt)
  • Supports generation of zsh and bash command completion script files
  • Supports a single command as a stand-alone application



go get github.com/gookit/gcli/v2

Quick start

package main

import (

// for test run: go build ./_examples/cliapp.go && ./cliapp
func main() {
    app := gcli.NewApp()
    app.Version = "1.0.3"
    app.Description = "this is my cli application"
    // app.SetVerbose(gcli.VerbDebug)

        Name: "demo",
        // allow color tag and {$cmd} will be replace to 'demo'
        UseFor: "this is a description <info>message</> for {$cmd}", 
        Aliases: []string{"dm"},
        Func: func (cmd *gcli.Command, args []string) error {
            gcli.Print("hello, in the demo command\n")
            return 0

    // .... add more ...



  • build a demo package
% go build ./_examples/cliapp.go                                                           

Display version

% ./cliapp --version      
# or use -V                                                 
% ./cliapp -V                                                     


Display app help

by ./cliapp or ./cliapp -h or ./cliapp --help


./cliapp -h # can also
./cliapp --help # can also


Run Command

% ./cliapp example -c some.txt -d ./dir --id 34 -n tom -n john val0 val1 val2 arrVal0 arrVal1 arrVal2

you can see:


Display Command Help

by ./cliapp example -h or ./cliapp example --help


Error Command Tips

[command tips](_examples/images/err-cmd-tips.jpg)

Generate Auto Completion Scripts

import  "github.com/gookit/gcli/v2/builtin"

    // ...
    // add gen command(gen successful you can remove it)

Build and run command(This command can be deleted after success.):

% go build ./_examples/cliapp.go && ./cliapp genac -h // display help
% go build ./_examples/cliapp.go && ./cliapp genac // run gen command

will see:

  {shell:zsh binName:cliapp output:auto-completion.zsh}

Now, will write content to file auto-completion.zsh
Continue? [yes|no](default yes): y

OK, auto-complete file generate successful

After running, it will generate an auto-completion.{zsh|bash} file in the current directory, and the shell environment name is automatically obtained. Of course you can specify it manually at runtime

Generated shell script file ref:

  • bash env [auto-completion.bash](resource/auto-completion.bash)
  • zsh env [auto-completion.zsh](resource/auto-completion.zsh)



Write a command

Quick add

    Name: "demo",
    // allow color tag and {$cmd} will be replace to 'demo'
    UseFor: "this is a description <info>message</> for command {$cmd}", 
    Aliases: []string{"dm"},
    Func: func (cmd *gcli.Command, args []string) error {
        gcli.Print("hello, in the demo command\n")
        return nil

Write go file

the source file at: [example.go](_examples/cmd/example.go)

package cmd

import (


// options for the command
var exampleOpts = struct {
    id  int
    c   string
    dir string
    opt string
    names gcli.Strings

// ExampleCommand command definition
var ExampleCommand = &gcli.Command{
    Name:        "example",
    UseFor: "this is a description message",
    Aliases:     []string{"exp", "ex"}, // 命令别名
    // {$binName} {$cmd} is help vars. '{$cmd}' will replace to 'example'
    Examples: `{$binName} {$cmd} --id 12 -c val ag0 ag1
<cyan>{$fullCmd} --names tom --names john -n c</> test use special option`,
    Config: func(c *gcli.Command) {
        // 绑定命令选项信息
        c.IntOpt(&exampleOpts.id, "id", "", 2, "the id option")
        c.StrOpt(&exampleOpts.c, "config", "c", "value", "the config option")
        // notice `DIRECTORY` will replace to option value type
        c.StrOpt(&exampleOpts.dir, "dir", "d", "", "the `DIRECTORY` option")
        // 支持设置选项短名称
        c.StrOpt(&exampleOpts.opt, "opt", "o", "", "the option message")
        // 支持绑定自定义变量, 但必须实现 flag.Value 接口
        c.VarOpt(&exampleOpts.names, "names", "n", "the option message")

        // 绑定命令参数信息,按参数位置绑定
        c.AddArg("arg0", "the first argument, is required", true)
        c.AddArg("arg1", "the second argument, is required", true)
        c.AddArg("arg2", "the optional argument, is optional")
        c.AddArg("arrArg", "the array argument, is array", false, true)
    Func:  exampleExecute,

// 命令执行主逻辑代码
// example run:
//  go run ./_examples/cliapp.go ex -c some.txt -d ./dir --id 34 -n tom -n john val0 val1 val2 arrVal0 arrVal1 arrVal2
func exampleExecute(c *gcli.Command, args []string) error {
    fmt.Print("hello, in example command\n")

    magentaln := color.Magenta.Println

    magentaln("All options:")
    fmt.Printf("%+v\n", exampleOpts)
    magentaln("Raw args:")
    fmt.Printf("%v\n", args)

    magentaln("Get arg by name:")
    arr := c.Arg("arrArg")
    fmt.Printf("named array arg '%s', value: %v\n", arr.Name, arr.Value)

    magentaln("All named args:")
    for _, arg := range c.Args() {
        fmt.Printf("named arg '%s': %+v\n", arg.Name, *arg)

    return nil
  • display the command help:
go build ./_examples/cliapp.go && ./cliapp example -h


Bind Option(flag)

Available methods:

BoolOpt(p *bool, name, shorts string, defValue bool, desc string)
BoolVar(p *bool, meta FlagMeta)
Float64Opt(p *float64, name, shorts string, defValue float64, desc string)
Float64Var(p *float64, meta FlagMeta)
Int64Opt(p *int64, name, shorts string, defValue int64, desc string)
Int64Var(p *int64, meta FlagMeta)
IntOpt(p *int, name, shorts string, defValue int, desc string)
IntVar(p *int, meta FlagMeta)
StrOpt(p *string, name, shorts, defValue, desc string)
StrVar(p *string, meta FlagMeta)
Uint64Opt(p *uint64, name, shorts string, defValue uint64, desc string)
Uint64Var(p *uint64, meta FlagMeta)
UintOpt(p *uint, name, shorts string, defValue uint, desc string)
UintVar(p *uint, meta FlagMeta)
Var(p flag.Value, meta FlagMeta)
VarOpt(p flag.Value, name, shorts, desc string)

Usage examples:

var id int
var b bool
var opt, dir string
var f1 float64
var names gcli.Strings

// bind options
cmd.IntOpt(&id, "id", "", 2, "the id option")
cmd.BoolOpt(&b, "bl", "b", false, "the bool option")
// notice `DIRECTORY` will replace to option value type
cmd.StrOpt(&dir, "dir", "d", "", "the `DIRECTORY` option")
// setting option name and short-option name
cmd.StrOpt(&opt, "opt", "o", "", "the option message")
// setting a special option var, it must implement the flag.Value interface
cmd.VarOpt(&names, "names", "n", "the option message")

Bind Argument

About arguments:

  • Required argument cannot be defined after optional argument
  • Only one array parameter is allowed
  • The (array)argument of multiple values ​​can only be defined at the end

Available methods:

Add(arg Argument) *Argument
AddArg(name, desc string, requiredAndIsArray ...bool) *Argument
AddArgument(arg *Argument) *Argument
BindArg(arg Argument) *Argument

Usage examples:

cmd.AddArg("arg0", "the first argument, is required", true)
cmd.AddArg("arg1", "the second argument, is required", true)
cmd.AddArg("arg2", "the optional argument, is optional")
cmd.AddArg("arrArg", "the array argument, is array", false, true)

can also use Arg()/BindArg():

cmd.Arg("arg0", gcli.Argument{
    Name: "ag0",
    Desc: "the first argument, is required",
    Require: true,
cmd.BindArg("arg0", gcli.Argument{
    Name: "ag0",
    Desc: "the second argument, is required",
    Require: true,
cmd.Arg("arg2", gcli.Argument{
    Name: "ag0",
    Desc: "the third argument, is is optional",

cmd.BindArg("arrArg", gcli.Argument{
    Name: "arrArg",
    Desc: "the third argument, is is array",
    IsArray: true,

Progress display

Package progress provide terminal progress bar display.

Such as: Txt, Bar, Loading, RoundTrip, DynamicText ...

  • progress.Bar progress bar

Demo: ./cliapp prog bar


  • progress.Txt text progress bar

Demo: ./cliapp prog txt


  • progress.LoadBar pending/loading progress bar


  • progress.Counter counter
  • progress.RoundTrip round trip progress bar
[===     ] -> [    === ] -> [ ===    ]


  • progress.DynamicText dynamic text message


package main

import (


func main()  {
    speed := 100
    maxSteps := 110
    p := progress.Bar(maxSteps)

    for i := 0; i < maxSteps; i++ {
        time.Sleep(time.Duration(speed) * time.Millisecond)


more demos please see [progress_demo.go](_examples/cmd/progress_demo.go)

run demos:

go run ./_examples/cliapp.go prog txt
go run ./_examples/cliapp.go prog bar
go run ./_examples/cliapp.go prog roundTrip


Interactive methods

console interactive methods

  • interact.ReadInput
  • interact.ReadLine
  • interact.ReadFirst
  • interact.Confirm
  • interact.Select/Choice
  • interact.MultiSelect/Checkbox
  • interact.Question/Ask
  • interact.ReadPassword


package main

import (


func main() {
    username, _ := interact.ReadLine("Your name?")
    password := interact.ReadPassword("Your password?")

    ok := interact.Confirm("ensure continue?")
    if !ok {
        // do something...

    fmt.Printf("username: %s, password: %s\n", username, password)

Read Input

read user input message

ans, _ := interact.ReadLine("Your name? ")

if ans != "" {
    color.Println("Your input: ", ans)
} else {
    color.Cyan.Println("No input!")



ans := interact.SelectOne(
    "Your city name(use array)?",
    []string{"chengdu", "beijing", "shanghai"},
color.Comment.Println("your select is: ", ans)


Multi Select/Checkbox

ans := interact.MultiSelect(
    "Your city name(use array)?",
    []string{"chengdu", "beijing", "shanghai"},
color.Comment.Println("your select is: ", ans)


Confirm Message

if interact.Confirm("Ensure continue") {
    fmt.Println(emoji.Render(":smile: Confirmed"))
} else {


Read Password

pwd := interact.ReadPassword()

color.Comment.Println("your input password is: ", pwd)


CLI Color

Terminal color use gookit/color Support windows cmd.exe powerShell

  • Color output display



package main

import (

func main() {
    // simple usage
    color.Cyan.Printf("Simple to use %s\n", "color")

    // internal theme/style:

    // custom color
    color.New(color.FgWhite, color.BgBlack).Println("custom color style")

    // can also:
    color.Style{color.FgCyan, color.OpBold}.Println("custom color style")

    // use defined color tag
    color.Print("use color tag: <suc>he</><comment>llo</>, <cyan>wel</><red>come</>\n")

    // use custom color tag
    color.Print("custom color tag: <fg=yellow;bg=black;op=underscore;>hello, welcome</>\n")

    // set a style tag
    color.Tag("info").Println("info style text")

    // prompt message
    color.Info.Prompt("prompt style message")
    color.Warn.Prompt("prompt style message")

    // tips message
    color.Info.Tips("tips style message")
    color.Warn.Tips("tips style message")

More usage

  • Basic color
color.Bold.Println("bold message")
color.Yellow.Println("yellow message")
  • Extra themes
color.Info.Println("Info message")
color.Danger.Println("Danger message")
color.Error.Println("Error message")
color.Success.Println("Success message")
  • Use like html tag

Support working on windows cmd.exe powerShell

// use style tag
color.Print("<suc>he</><comment>llo</>, <cyan>wel</><red>come</>")

// custom color attributes
color.Print("<fg=yellow;bg=black;op=underscore;>hello, welcome</>\n")

For more information on the use of color libraries, please visit gookit/color

Gookit packages

  • gookit/ini Go config management, use INI files
  • gookit/rux Simple and fast request router for golang HTTP
  • gookit/gcli build CLI application, tool library, running CLI commands
  • gookit/event Lightweight event manager and dispatcher implements by Go
  • gookit/cache Generic cache use and cache manager for golang. support File, Memory, Redis, Memcached.
  • gookit/config Go config management. support JSON, YAML, TOML, INI, HCL, ENV and Flags
  • gookit/color A command-line color library with true color support, universal API methods and Windows support
  • gookit/filter Provide filtering, sanitizing, and conversion of golang data
  • gookit/validate Use for data validation and filtering. support Map, Struct, Form data
  • gookit/goutil Some utils for the Go: string, array/slice, map, format, cli, env, filesystem, test and more
  • More please see https://github.com/gookit

See also



*Note that all licence references and agreements mentioned in the GCli README section above are relevant to that project's source code only.