Function std::env::var

pub fn var<K: AsRef<OsStr>>(key: K) -> Result<String, VarError>

Fetches the environment variable key from the current process.

Errors

Returns [None] if the environment variable isn’t set. Returns [None] if the environment variable is not valid Unicode. If this is not desired, consider using var_os.

Examples

use std::env;

let key = "HOME";
match env::var(key) {
    Ok(val) => println!("{}: {:?}", key, val),
    Err(e) => println!("couldn't interpret {}: {}", key, e),
}