std::process::Command executes without error but nothing happens

I'm trying to cd into a directory that contains steamcmd.exe and run a command. When I run this code no error occurs and nothing actually happens.

use std::{process::Command};

let steamcmd_dir = String::from("C:/Users/user/Desktop/steamcmd");
let content = String::from("steamcmd +login anonymous");
let mut command = Command::new("cmd");

command.arg("/C");
command.arg("cd");
command.arg("/C");
command.arg(steamcmd_dir);
command.arg("/C");
command.arg(content);

command.output().unwrap();

Command::output() documentation explains:

> Executes the command as a child process, waiting for it to finish and collecting all of its output.

SteamCMD works similarly to e.g a database CLI client in the sense that you can use it both interactively as well as for one-off commands using its command line flags. However the flags you supplied to SteamCMD makes it run in interactive mode and not exit at all, so you need to append +quit for SteamCMD to exit when it is finished, like so:

steamcmd +login anonymous +quit

You also don't necessarily need to go through cmd and cd to where SteamCMD is located, you can reference the executable directly if that's desirable to you:

let output = Command::new("C:/Users/user/Desktop/steamcmd/steamcmd.exe")
    .args(["+login", "anonymous", "+quit"])
    .output()
    .unwrap();

From the docs on cmd:
> To use multiple commands for <string>, separate them by the command separator &&.

So instead you can use something like this:

use std::process::Command;

fn main() {
    let steamcmd_dir = String::from("C:/Users/user/Desktop/steamcmd");
    let content = String::from("steamcmd +login anonymous");
    let mut command = Command::new("cmd")
        .arg("/C")
        .arg([format!("cd {}", steamcmd_dir), content].join("&&"));

    command.output().unwrap();
}

However you can also avoid using cmd alltogether by using std::env::set_current_dir to change the current processes working directory and then running steamcwd directly like in Svenskunganka's answer:

fn main() {
    let steamcmd_dir = String::from("C:/Users/user/Desktop/steamcmd");
    std::env::set_current_dir(steamcmd_dir).unwrap();
    let mut command = Command::new("steamcmd")
        .args(["+login", "anonymous", "+quit"]);

    command.output().unwrap();
}