Golang - flag.Arg(0) returns index 1 instead of index 0 of arguments passed by exec.cmd-CodePudding

I currently have something in my bar app that looks like this

flag.Parse()
str := flag.Arg(0)
fmt.println(str)

Now in my foo app I have something like this

var stdout, stderr bytes.Buffer
    cmd := exec.Cmd{
        Path:   c.Path,
        Args:   c.Args,
        Env:    c.Env,
        Stdin:  bytes.NewReader(b),
        Stdout: &stdout,
        Stderr: &stderr,
    }

    if err := cmd.Start(); err != nil {
        return err
    }

Now in the above c.Args = [1,2,3]

foo program attempts to call into bar program and bar displays 2 How do I make bar display 1 instead.

I know flag.parse ignores the first parameter. How do I tell read the first parameter (index 0) using flag.Arg()

CodePudding user response：

Cmd.Args includes the command name. flag.Arg(0) is the first argument after the command name and flags.

Fix by adding the command name to Cmd.Args.

cmd := exec.Cmd{
    Path:   c.Path,
    Args:   append([]string{c.Path}, c.Args...),
    Env:    c.Env,
    Stdin:  bytes.NewReader(b),
    Stdout: &stdout,
    Stderr: &stderr,
}