Read environment variable



    Giovanny Gongora

    Codiga's Rust Recipes

    read or set fallback

    use std::env;
    use std::fs;
    use std::io::Error;
    fn main() -> Result<(), Error> {
      // read `config_path` from the environment variable `CONFIG`.
      // If `CONFIG` isn't set, fall back to a default config path.
      let config_path = env::var("CONFIG")
      let config: String = fs::read_to_string(config_path)?;
      println!("Config: {}", config);
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