英文:
How to access command line arguments with hyphens but without value in Go Lang
问题
我想要访问带有连字符的命令行参数，例如：
go run user.go -version
或者
go run user.go --version
当我执行这样的命令时，我收到以下错误信息：
flag provided but not defined: -versionUsage of /tmp/go-build354377460/command-line-arguments/_obj/exe/user:--version stringprints current version and exitsexit status 2
以下是我的代码：
package mainimport ("flag""fmt")func main() {var version stringflag.StringVar(&version, "-version", "", "prints current version and exits")// 解析命令行参数flag.Parse()fmt.Println(flag.Args())}
非常感谢您的帮助。提前致谢。
英文:
I want to access command line arguments with hyphens for example:
go run user.go -version
or
go run user.go --version
When I executing like this, I received the below error:
flag provided but not defined: -versionUsage of /tmp/go-build354377460/command-line-arguments/_obj/exe/user:--version stringprints current version and exitsexit status 2
Here is my code:
package mainimport ("flag""fmt")func main() {var version stringflag.StringVar(&version, "-version", "", "prints current version and exits")// Parse the flagsflag.Parse()fmt.Println(flag.Args())}
Any help is greatly appreciated. Thanks in advance.
答案1
得分: 3
使用布尔类型。在标志定义中不要包含“-”。
func main() {var version boolflag.BoolVar(&version, "version", false, "打印当前版本并退出")flag.Parse()if version {fmt.Println("hello")return}fmt.Println(flag.Args())}
英文:
Use a bool. Do not include the "-" in the flag definition.
func main() {var version boolflag.BoolVar(&version, "version", false, "prints current version and exits")flag.Parse()if version {fmt.Println("hello")return}fmt.Println(flag.Args())}
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