Usage Output

A usage message shows the accepted command shape when input is incomplete or unclear.

usage_output.go

package main

import "fmt"

func usage(command string) []string {
	lines := []string{
		"usage: tool " + command + " [options]",
		"  --help     show help",
		"  --limit N  choose a small limit",
	}
	return lines
}

func main() {
	var command = 
	lines := usage(command)

	for index, line := range lines {
		fmt.Println(index, line)
	}
	fmt.Println("lineCount=", len(lines))
}

package main

import "fmt"

func usage(command string) []string {
	lines := []string{
		"usage: tool " + command + " [options]",
		"  --help     show help",
		"  --limit N  choose a small limit",
	}
	return lines
}

func main() {
	var command = 
	lines := usage(command)

	for index, line := range lines {
		fmt.Println(index, line)
	}
	fmt.Println("lineCount=", len(lines))
}

package main

import "fmt"

func usage(command string) []string {
	lines := []string{
		"usage: tool " + command + " [options]",
		"  --help     show help",
		"  --limit N  choose a small limit",
	}
	return lines
}

func main() {
	var command = 
	lines := usage(command)

	for index, line := range lines {
		fmt.Println(index, line)
	}
	fmt.Println("lineCount=", len(lines))
}

usage text Usage text is a short guide that tells the user how to call a command.