diff --git a/cmd/example-cmd.go b/cmd/example-cmd.go
new file mode 100644
index 0000000..139ae26
--- /dev/null
+++ b/cmd/example-cmd.go
@@ -0,0 +1,39 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"go.fifitido.net/cmd"
+	"go.fifitido.net/cmd/opt"
+)
+
+var (
+	so = opt.String("string", "s", "", "example string option")
+	io = opt.Int("int", "i", 0, "example int option")
+	fo = opt.Float("float", "f", 0, "example float option")
+	bo = opt.Bool("bool", "b", false, "example bool option")
+)
+
+var root = cmd.NewRoot(
+	"example-cmd",
+	cmd.WithShortDescription("Example command"),
+	cmd.WithLongDescription(`An example command to show how to use go.fifitido.net/cmd
+
+this example is just a simple hello world program to show
+the basics of the library.`),
+	cmd.WithArgument("name", false),
+	cmd.WithSubcommand(cmd.CompletionsSubcommand()),
+	cmd.WithOptions(so, io, fo, bo),
+	cmd.WithRunFunc(func(args []string) {
+		if len(args) == 0 {
+			fmt.Println("Hello World!")
+		} else {
+			fmt.Printf("Hello %s!\n", args[0])
+		}
+	}),
+)
+
+func main() {
+	root.Execute(os.Args)
+}
diff --git a/command.go b/command.go
index 9741938..5112b00 100644
--- a/command.go
+++ b/command.go
@@ -3,32 +3,31 @@ package cmd
 import (
 	"fmt"
 	"os"
-	"path/filepath"
 
 	"go.fifitido.net/cmd/opt"
 )
 
 type Command struct {
-	name             string
-	shortDescription string
-	longDescription  string
-	aliases          []string
-	arguments        []*Argument
-	opts             opt.Set
-	subcommands      Set
-	parent           *Command
+	Name             string
+	ShortDescription string
+	LongDescription  string
+	Aliases          []string
+	Args             []*Argument
+	Opts             opt.Set
+	Subcommands      Set
+	Parent           *Command
 	run              func(args []string)
 	isRoot           bool
 }
 
-func NewRoot(options ...Option) *Command {
-	cmd := &Command{isRoot: true}
+func NewRoot(name string, options ...Option) *Command {
+	cmd := &Command{Name: name, isRoot: true}
 	cmd.ApplyOptions(options...)
 	return cmd
 }
 
 func New(name string, options ...Option) *Command {
-	cmd := &Command{name: name}
+	cmd := &Command{Name: name}
 	cmd.ApplyOptions(options...)
 	return cmd
 }
@@ -44,15 +43,20 @@ func (c *Command) Root() *Command {
 		return c
 	}
 
-	return c.parent.Root()
+	return c.Parent.Root()
 }
 
 func (c *Command) CommandPath() string {
-	if c.parent == nil {
-		return filepath.Base(os.Args[0])
+	if c.Parent == nil {
+		return ""
 	}
 
-	return c.parent.CommandPath() + " " + c.name
+	parentPath := c.Parent.CommandPath()
+	if parentPath == "" {
+		return c.Name
+	}
+
+	return c.Parent.CommandPath() + " " + c.Name
 }
 
 func (c *Command) CanRun() bool {
@@ -68,7 +72,7 @@ func (c *Command) Execute(args []string) {
 		args = args[1:]
 	}
 
-	parser := opt.NewParser(args, c.opts, false)
+	parser := opt.NewParser(args, c.Opts, false)
 	restArgs, err := parser.Parse()
 	if err != nil {
 		fmt.Println(err.Error())
@@ -77,7 +81,7 @@ func (c *Command) Execute(args []string) {
 	}
 
 	if len(restArgs) > 0 {
-		sc, ok := c.subcommands.Get(restArgs[0])
+		sc, ok := c.Subcommands.Get(restArgs[0])
 		if ok {
 			sc.Execute(restArgs[1:])
 			return
diff --git a/completions.go b/completions.go
new file mode 100644
index 0000000..0009e71
--- /dev/null
+++ b/completions.go
@@ -0,0 +1,124 @@
+package cmd
+
+import (
+	"io"
+	"os"
+
+	"go.fifitido.net/cmd/opt"
+)
+
+var outputFileOption = opt.String("output", "o", "", "The file to output the completions to")
+
+func CompletionsSubcommand() *Command {
+	cmd := New(
+		"completions",
+		WithShortDescription("Generate shell completions"),
+		WithLongDescription("Generate shell completions"),
+	)
+
+	registerBashCompletions(cmd)
+	registerFishCompletions(cmd)
+	registerPowerShellCompletions(cmd)
+	registerZsgCompletions(cmd)
+
+	return cmd
+}
+
+func getCompletionsOut() io.Writer {
+	outputFile := outputFileOption.Value()
+
+	if outputFile != "" {
+		var err error
+		out, err := os.OpenFile(outputFile, os.O_WRONLY|os.O_CREATE, 0644)
+		if err != nil {
+			panic(err)
+		}
+		return out
+	}
+
+	return os.Stdout
+}
+
+func registerBashCompletions(parent *Command) *Command {
+	return New(
+		"bash",
+		WithShortDescription("Generate bash completions"),
+		WithLongDescription("Generate bash completions"),
+		WithOptions(outputFileOption),
+		WithParent(parent),
+		WithRunFunc(func(args []string) {
+			out := getCompletionsOut()
+
+			if fc, ok := out.(io.Closer); ok {
+				defer fc.Close()
+			}
+
+			if err := WriteBashCompletions(out, parent.Root()); err != nil {
+				panic(err)
+			}
+		}),
+	)
+}
+
+func registerFishCompletions(parent *Command) *Command {
+	return New(
+		"fish",
+		WithShortDescription("Generate fish completions"),
+		WithLongDescription("Generate fish completions"),
+		WithOptions(outputFileOption),
+		WithParent(parent),
+		WithRunFunc(func(args []string) {
+			out := getCompletionsOut()
+
+			if fc, ok := out.(io.Closer); ok {
+				defer fc.Close()
+			}
+
+			if err := WriteFishCompletions(out, parent.Root()); err != nil {
+				panic(err)
+			}
+		}),
+	)
+}
+
+func registerPowerShellCompletions(parent *Command) *Command {
+	return New(
+		"powershell",
+		WithShortDescription("Generate powershell completions"),
+		WithLongDescription("Generate powershell completions"),
+		WithOptions(outputFileOption),
+		WithParent(parent),
+		WithRunFunc(func(args []string) {
+			out := getCompletionsOut()
+
+			if fc, ok := out.(io.Closer); ok {
+				defer fc.Close()
+			}
+
+			if err := WritePowerShellCompletions(out, parent.Root()); err != nil {
+				panic(err)
+			}
+		}),
+	)
+}
+
+func registerZsgCompletions(parent *Command) *Command {
+	return New(
+		"zsh",
+		WithShortDescription("Generate zsh completions"),
+		WithLongDescription("Generate zsh completions"),
+		WithOptions(outputFileOption),
+		WithParent(parent),
+		WithRunFunc(func(args []string) {
+			out := getCompletionsOut()
+
+			if fc, ok := out.(io.Closer); ok {
+				defer fc.Close()
+			}
+
+			if err := WriteZshCompletions(out, parent.Root()); err != nil {
+				panic(err)
+			}
+		}),
+	)
+}
diff --git a/completions_bash.go b/completions_bash.go
new file mode 100644
index 0000000..a790090
--- /dev/null
+++ b/completions_bash.go
@@ -0,0 +1,19 @@
+package cmd
+
+import (
+	"io"
+	"text/template"
+
+	"go.fifitido.net/cmd/opt"
+)
+
+func WriteBashCompletions(out io.Writer, rootCmd *Command) error {
+	return bashTpl.Execute(out, map[string]any{
+		"rootCmd":    rootCmd,
+		"globalOpts": opt.Globals(),
+	})
+}
+
+var bashTpl = template.Must(template.New("bash").Parse(`
+	
+`))
diff --git a/completions_fish.go b/completions_fish.go
new file mode 100644
index 0000000..8e0228d
--- /dev/null
+++ b/completions_fish.go
@@ -0,0 +1,99 @@
+package cmd
+
+import (
+	"io"
+	"text/template"
+
+	"go.fifitido.net/cmd/opt"
+)
+
+func WriteFishCompletions(out io.Writer, rootCmd *Command) error {
+	return fishTpl.Execute(out, map[string]any{
+		"RootCmd":    rootCmd,
+		"GlobalOpts": opt.Globals(),
+	})
+}
+
+var fishTpl = template.Must(template.New("fish").Funcs(tplFuncs).Parse(`
+{{- $rootCmd := .RootCmd -}}
+{{- $progName := $rootCmd.Name -}}
+{{- $varName := under $rootCmd.Name -}}
+set -l commands {{- range $rootCmd.Subcommands }} {{ .Name }}{{ end }}
+
+function __fish_{{ $varName }}_needs_command
+	set -l cmd (commandline -opc)
+	if test (count $cmd) -eq 1
+		return 0
+	end
+	return 1
+end
+
+function __fish_{{ $varName }}_using_command
+	set -l cmd (commandline -opc)
+	set -l cnt (count $argv)
+	if test (count $cmd) -gt $cnt
+		for i in (seq 1 $cnt);
+			if test $argv[$i] != $cmd[(math $i + 1)]
+				return 1
+			end
+		end
+		return 0
+	end
+	return 1
+end
+
+{{/* Option template */ -}}
+{{ define "opt" }}
+{{ $progName := .ProgName -}}
+{{- $varName := .VarName -}}
+complete -c {{ $progName }}
+{{- if ne .Opt.ShortName "" }} -s {{ .Opt.ShortName }} {{ end -}}
+{{- if ne .Opt.Name "" }} -l {{ .Opt.Name }} {{ end -}} 
+{{- if .Cmd }} {{- if ne .Cmd.CommandPath "" -}}
+-n "__fish_{{ $varName }}_using_command {{.Cmd.CommandPath}}" {{ else -}}
+-n "__fish_{{ $varName }}_needs_command" {{ end -}}{{- end -}}
+-d '{{ .Opt.Description }}'
+{{- end }}
+
+{{- /* Command template */ -}}
+{{ define "cmd" }}
+{{ $progName := .ProgName -}}
+{{- $varName := .VarName -}}
+{{- $cmd := .Cmd -}}
+{{- $parentVarPrefix := varPrefix .Cmd.Parent.CommandPath -}}
+{{- $varPrefix := varPrefix .Cmd.CommandPath -}}
+
+{{- if eq .Cmd.Parent.CommandPath "" -}}
+complete -f -c {{ $progName }} -n "__fish_{{ $varName }}_needs_command" -a {{ .Cmd.Name }} -d "{{ .Cmd.ShortDescription }}"
+{{- else -}}
+complete -f -c {{ $progName }} -n "__fish_{{ $varName }}_using_command {{.Cmd.Parent.CommandPath}}" -a {{ .Cmd.Name }} -d "{{ .Cmd.ShortDescription }}"
+{{- end -}}
+
+{{- range .Cmd.Opts }}
+{{- template "opt" (map "Opt" . "ProgName" $progName "VarName" $varName "Cmd" $cmd) -}}
+{{ end -}}
+
+{{ if gt (len .Cmd.Subcommands) 0  }}
+set -l {{ $varPrefix }}commands {{- range .Cmd.Subcommands }} {{ .Name }}{{ end -}}
+{{ $cmdName := .Cmd.Name }}
+{{- range .Cmd.Subcommands }}
+{{- template "cmd" (map "Cmd" . "ProgName" $progName "VarName" $varName) -}}
+{{ end -}}
+{{- end -}}
+{{ end }}
+
+{{- /* Top-level commands */ -}}
+{{ range $rootCmd.Subcommands }}
+{{- template "cmd" (map "Cmd" . "ProgName" $progName "VarName" $varName) -}}
+{{ end }}
+
+{{- /* Root command options */ -}}
+{{ range $rootCmd.Opts }}
+{{- template "opt" (map "Opt" . "ProgName" $progName "VarName" $varName "Cmd" $rootCmd) -}}
+{{ end }}
+
+{{- /* Global options */ -}}
+{{ range .GlobalOpts }}
+{{- template "opt" (map "Opt" . "ProgName" $progName "VarName" $varName) -}}
+{{ end }}
+`))
diff --git a/completions_powershell.go b/completions_powershell.go
new file mode 100644
index 0000000..a0f271a
--- /dev/null
+++ b/completions_powershell.go
@@ -0,0 +1,19 @@
+package cmd
+
+import (
+	"io"
+	"text/template"
+
+	"go.fifitido.net/cmd/opt"
+)
+
+func WritePowerShellCompletions(out io.Writer, rootCmd *Command) error {
+	return powerShellTpl.Execute(out, map[string]any{
+		"rootCmd":    rootCmd,
+		"globalOpts": opt.Globals(),
+	})
+}
+
+var powerShellTpl = template.Must(template.New("PowerShell").Parse(`
+	
+`))
diff --git a/completions_zsh.go b/completions_zsh.go
new file mode 100644
index 0000000..885ec41
--- /dev/null
+++ b/completions_zsh.go
@@ -0,0 +1,19 @@
+package cmd
+
+import (
+	"io"
+	"text/template"
+
+	"go.fifitido.net/cmd/opt"
+)
+
+func WriteZshCompletions(out io.Writer, rootCmd *Command) error {
+	return zshTpl.Execute(out, map[string]any{
+		"rootCmd":    rootCmd,
+		"globalOpts": opt.Globals(),
+	})
+}
+
+var zshTpl = template.Must(template.New("zsh").Parse(`
+	
+`))
diff --git a/examples/hello-world/cmd/main.go b/examples/hello-world/cmd/main.go
index 57064a5..b742cec 100644
--- a/examples/hello-world/cmd/main.go
+++ b/examples/hello-world/cmd/main.go
@@ -8,6 +8,7 @@ import (
 )
 
 var root = cmd.NewRoot(
+	"hello-world",
 	cmd.WithShortDescription("Example command"),
 	cmd.WithLongDescription(`An example command to show how to use go.fifitido.net/cmd
 
diff --git a/help.go b/help.go
index 18819bf..62c4496 100644
--- a/help.go
+++ b/help.go
@@ -8,13 +8,14 @@ import (
 
 func (c *Command) ShowHelp() {
 	cmdPath := c.CommandPath()
+	binaryName := c.Root().Name
 
-	fmt.Println(c.longDescription)
+	fmt.Println(c.LongDescription)
 	fmt.Println()
 	fmt.Println("Usage: ")
-	fmt.Printf("  %s ", cmdPath)
+	fmt.Printf("  %s %s ", binaryName, cmdPath)
 
-	if len(c.subcommands) > 0 {
+	if len(c.Subcommands) > 0 {
 		if c.CanRun() {
 			fmt.Print("[command] ")
 		} else {
@@ -22,8 +23,8 @@ func (c *Command) ShowHelp() {
 		}
 	}
 	fmt.Print("[options]")
-	if len(c.arguments) > 0 {
-		for _, a := range c.arguments {
+	if len(c.Args) > 0 {
+		for _, a := range c.Args {
 			if a.Required {
 				fmt.Print(" <" + a.Name + ">")
 			} else {
@@ -33,7 +34,7 @@ func (c *Command) ShowHelp() {
 	}
 	fmt.Println()
 
-	if len(c.subcommands) > 0 {
+	if len(c.Subcommands) > 0 {
 		fmt.Println()
 
 		if c.isRoot {
@@ -42,16 +43,16 @@ func (c *Command) ShowHelp() {
 			fmt.Println("Available subcommands:")
 		}
 
-		for _, s := range c.subcommands {
-			fmt.Println("  " + s.name + "    " + s.shortDescription)
+		for _, s := range c.Subcommands {
+			fmt.Println("  " + s.Name + "    " + s.ShortDescription)
 		}
 	}
 
-	if len(c.opts) > 0 {
+	if len(c.Opts) > 0 {
 		fmt.Println()
 		fmt.Println("Available options:")
-		paddedWidth := c.opts.MaxWidth()
-		for _, f := range c.opts {
+		paddedWidth := c.Opts.MaxWidth()
+		for _, f := range c.Opts {
 			fmt.Println("  " + opt.HelpLine(f, paddedWidth))
 		}
 	}
@@ -66,8 +67,8 @@ func (c *Command) ShowHelp() {
 		}
 	}
 
-	if len(c.subcommands) > 0 {
+	if len(c.Subcommands) > 0 {
 		fmt.Println()
-		fmt.Printf("Run '%s <command> --help' for more information about a command.\n", c.Root().CommandPath())
+		fmt.Printf("Run '%s <command> --help' for more information about a command.\n", binaryName)
 	}
 }
diff --git a/option.go b/option.go
index 6f0db66..90a057d 100644
--- a/option.go
+++ b/option.go
@@ -8,60 +8,60 @@ type Option func(*Command)
 
 func WithShortDescription(s string) Option {
 	return func(c *Command) {
-		c.shortDescription = s
+		c.ShortDescription = s
 	}
 }
 
 func WithLongDescription(s string) Option {
 	return func(c *Command) {
-		c.longDescription = s
+		c.LongDescription = s
 	}
 }
 
 func WithArgument(name string, required bool) Option {
 	return func(c *Command) {
-		c.arguments = append(c.arguments, &Argument{name, required})
+		c.Args = append(c.Args, &Argument{name, required})
 	}
 }
 
 func WithArguments(args ...*Argument) Option {
 	return func(c *Command) {
-		c.arguments = append(c.arguments, args...)
+		c.Args = append(c.Args, args...)
 	}
 }
 
 func WithOption(f opt.Option) Option {
 	return func(c *Command) {
-		c.opts = append(c.opts, f)
+		c.Opts = append(c.Opts, f)
 	}
 }
 
 func WithOptions(os ...opt.Option) Option {
 	return func(c *Command) {
-		c.opts = append(c.opts, os...)
+		c.Opts = append(c.Opts, os...)
 	}
 }
 
 func WithSubcommand(s *Command) Option {
 	return func(c *Command) {
-		c.subcommands.Add(c)
-		s.parent = c
+		c.Subcommands.Add(s)
+		s.Parent = c
 	}
 }
 
 func WithSubcommands(ss ...*Command) Option {
 	return func(c *Command) {
-		c.subcommands.Add(c)
 		for _, s := range ss {
-			s.parent = c
+			c.Subcommands.Add(s)
+			s.Parent = c
 		}
 	}
 }
 
 func WithParent(p *Command) Option {
 	return func(c *Command) {
-		c.parent = p
-		p.subcommands.Add(c)
+		c.Parent = p
+		p.Subcommands.Add(c)
 	}
 }
 
diff --git a/set.go b/set.go
index 58110a2..2ef3976 100644
--- a/set.go
+++ b/set.go
@@ -12,11 +12,11 @@ func (s *Set) Add(c *Command) {
 
 func (s Set) Get(name string) (*Command, bool) {
 	for _, c := range s {
-		if c.name == name {
+		if c.Name == name {
 			return c, true
 		}
 
-		for _, alias := range c.aliases {
+		for _, alias := range c.Aliases {
 			if alias == name {
 				return c, true
 			}
@@ -28,7 +28,7 @@ func (s Set) Get(name string) (*Command, bool) {
 func (s Set) MaxNameWidth() int {
 	max := 0
 	for _, f := range s {
-		if w := len(f.name); w > max {
+		if w := len(f.Name); w > max {
 			max = w
 		}
 	}
diff --git a/tpl_funcs.go b/tpl_funcs.go
new file mode 100644
index 0000000..dd41bfa
--- /dev/null
+++ b/tpl_funcs.go
@@ -0,0 +1,42 @@
+package cmd
+
+import (
+	"fmt"
+	"strings"
+	"text/template"
+)
+
+var tplFuncs = template.FuncMap{
+	"map":       tplMap,
+	"join":      tplJoin,
+	"under":     tplUnder,
+	"varPrefix": tplVarPrefix,
+}
+
+func tplMap(vals ...any) (map[string]any, error) {
+	if len(vals)%2 != 0 {
+		return nil, fmt.Errorf("missing value, need one key and one value per kv pair")
+	}
+
+	m := make(map[string]any)
+	for i := 0; i < len(vals); i += 2 {
+		m[vals[i].(string)] = vals[i+1]
+	}
+	return m, nil
+}
+
+func tplJoin(strs ...string) string {
+	return strings.Join(strs, "")
+}
+
+func tplUnder(s string) string {
+	return strings.ToLower(strings.ReplaceAll(strings.ReplaceAll(s, " ", "_"), "-", "_"))
+}
+
+func tplVarPrefix(s string) string {
+	if s == "" {
+		return ""
+	}
+
+	return tplUnder(s) + "_"
+}