Creating Env variable

Question

At my Windows 11 machine, trying to check if the env variable "" exists or no, if yes, I need to read its value, if not there I need to set it, so I wrote the below code:

    tmpDir, exists := os.LookupEnv("keyTemp")
    fmt.Println("keyTemp: ", exists)
    fmt.Println("tmpDir: ", tmpDir)
    if !exists {
        tmpDir = os.TempDir() + "\\fitz"
        fmt.Println("tmpDir: ", tmpDir)
        err = os.Setenv("keyTemp", tmpDir)
        if err != nil {
            panic(err)
        }
    }

But always (after rerunning the binary) I'm getting the "exists" value as false and my env variable is never created!

What do you mean by always? Are you running the code in a loop? Or are you re-running the binary? If the latter then the answer is obvious, you'd need to persist the env var somehow (~/.bashrc, or ~/.profile, etc..) and reload the env before re-running the binary. — mkopriva, Jul 30 '21 at 11:17
I'm not sure with Windows, but [this](https://stackoverflow.com/a/5898184/965900) seems to me to be what you're looking for. — mkopriva, Jul 30 '21 at 11:33

score 0 · Accepted Answer · answered Jul 30 '21 at 11:47

Thanks to @mkopriva, it looks no direct way at go lang itself, so the option is to use cmd, so it worked with me as:

tmpDir = os.TempDir() + "\\fitz"
// err = os.Setenv("keyTemp", tmpDir)
err = exec.Command(`SETX`, `keyTemp`, tmpDir).Run()
if err != nil {
    fmt.Printf("Error: %s\n", err)
}

Creating Env variable

1 Answers1