How can I set persistent environment variables in Go?

Setting Persistent Environment Variables

In Go, you can set environment variables using the os.Setenv() function, which stores the variable within the current process. However, these variables are temporary and disappear after the process terminates.

Alternative Approach: Configuration Files

To maintain persistent environment variables, consider using a configuration file. This file would store the key-value pairs representing your environment variables.

Here's an example using the "viper" configuration library:

<code class="go">import "github.com/spf13/viper"

// LoadConfig loads the configuration file and sets the environment variables.
func LoadConfig(configFile string) error {
    viper.SetConfigFile(configFile)
    if err := viper.ReadInConfig(); err != nil {
        return err
    }

    // Retrieve the environment variables from the configuration file.
    for key, value := range viper.AllSettings() {
        if err := os.Setenv(key, value); err != nil {
            return err
        }
    }

    return nil
}</code>

By loading the configuration file upon process startup, you can set the environment variables before running the application. These variables will persist for the duration of the process and can be accessed using os.Getenv().

Remember to save any changes to the configuration file when appropriate to ensure the persistent storage of the environment variables.

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