ViewController.swift

class ViewController: NSViewController {
    
    @IBOutlet private weak var textField: NSTextField!
    @IBOutlet private weak var textView: NSTextView!
    
    private var bashService = BashService()
    
    @IBAction func execute(_ sender: Any) {
        bashService.execute(textField.stringValue) { response in
            DispatchQueue.main.async {
                self.textView.string += "\(response) \n"
                self.textField.stringValue = ""
            }
        }
    }
    
}