Go构建高性能的命令行工具使例详解

package main
import (
    "flag"
    "fmt"
)
func main() {
    // 定义命令行参数
    name := flag.String("name", "world", "a name to say hello to")
    flag.Parse() // 解析命令行参数
    // 使用命令行参数
    fmt.Printf("Hello, %s!\n", *name)
}

func main() {
    var name string
    flag.StringVar(&name, "name", "world", "a name to say hello to")
    flag.Parse()
    fmt.Printf("Hello, %s!\n", name)
}

import "github.com/spf13/cobra"
var rootCmd = &cobra.Command{
    Use:   "app",
    Short: "My application does awesome things",
}
func main() {
    rootCmd.Execute()
}

import "github.com/manifoldco/promptui"
func main() {
    prompt := promptui.Prompt{
        Label: "Enter your name",
    }
    result, _ := prompt.Run()
    fmt.Printf("Hello, %s!\n", result)
}

import "log"
func main() {
    // 日志输出
    log.Println("Starting the application...")
    // 错误处理
    if err := runApplication(); err != nil {
        log.Fatalf("Error: %v", err)
    }
}

go build -o mycli main.go

GOOS=linux GOARCH=amd64 go build -o mycli main.go

import "net/http"
func fetchUser(userID string) (*User, error) {
    resp, err := http.Get(fmt.Sprintf("https://api.example.com/users/%s", userID))
    // 处理请求
}