let ls_output = std::process::Command::new("pwd")
        .current_dir("./my-project")
        .output()
        .expect("Could not ls");

    match fs::write("ls.out", ls_output.stdout) {
        Ok(_) => println!("File saved successfully"),
        Err(e) => eprintln!("Error saving the file: {}", e),
    }
```
Writes to file with output:
```
/Users/mfiumara/repos/root-project/my-project