How to access command line arguments with hyphens but without value in Go Lang

Question

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: -version
Usage of /tmp/go-build354377460/command-line-arguments/_obj/exe/user:
  --version string
        prints current version and exits
exit status 2

Here is my code:

 package main

import (
    "flag"
    "fmt"
)

func main() {
    var version string
    flag.StringVar(&version, "-version", "", "prints current version and exits")

    // Parse the flags
    flag.Parse()

    fmt.Println(flag.Args())
}

Any help is greatly appreciated. Thanks in advance.

What does the code look like? Do you use the standard flag library? Please provide the code of user.go stripped down to have a working repro — Sascha
– Sascha, Commented Jan 11, 2017 at 13:31
I have added my code in the question, please review. Thanks for the response. — Test admin
– Test admin, Commented Jan 11, 2017 at 13:32

score 3 · Accepted Answer · 2017-01-11 13:39:56Z

3

Use a bool. Do not include the "-" in the flag definition.

func main() {
    var version bool
    flag.BoolVar(&version, "version", false, "prints current version and exits")
    flag.Parse()
    if version {
        fmt.Println("hello")
        return
    }
    fmt.Println(flag.Args())
}

edited Jan 11, 2017 at 13:39

answered Jan 11, 2017 at 13:34

user5728991

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2 Comments

Test admin Over a year ago

Tried the code. But it is not working. I need to run with the hyphen go run user.go -version like --help.

Test admin Over a year ago

Yes it's working. I cannot get the arguments. My flag.Args() is empty array.

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