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                > 系統命令 ``` go mod init hello//初始化hello //運行 go run hello.go //打包 go build hello.go //打包并命名 go build -o hello1.exe hello.go go build -race hello.go //可以查看協程競爭關系 ``` > 應用讀取參數 ``` package main import ( "fmt" "os" ) func main() { ? ? fmt.Println("命令行的參數有", len(os.Args)) ? ? for i, v := range os.Args { ? ? ? ? fmt.Printf("args[%v】=%v\n", i, v) ? ? } } hello.exe -a -b -c //第一個參數為文件路徑 go run hello -a -b -c//會先編譯為exe,第一個參數為文件路徑 ``` > 隨意參數順序 類似-u xxx -p yyy 使用flag包 ``` //變量 //指定參數前加- //默認值 //說明 flag.StringVar(&user,"u","默認值","說明") flag.IntVar(&user,"u","默認值","說明") flag.Parse()//最后一定要調用這個方法會轉換傳進來的args ```
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