Untitled

$ exec 3>salida.txt
$ exec 4>&1 1>&3
$ curl -H "Host: es.stackoverflow.com" -H "Referer: google.com" https://stackexchange.com
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 86632  100 86632    0     0   173k      0 --:--:-- --:--:-- --:--:--  173k
$ exec 1>&4 4>&- 3>&-

<!DOCTYPE html>
<html>

<head>

<title>Stack Overflow en espa&#241;ol</title>
    <link rel="shortcut icon" href="https://cdn.sstatic.net/Sites/es/img/favicon.ico?v=a8def514be8a">
    <link rel="apple-touch-icon image_src" href="https://cdn.sstatic.net/Sites/es/img/apple-touch-icon.png?v=7739871010e6">
    <link rel="search" type="application/opensearchdescription+xml" title="Stack Overflow en espa&#241;ol" href="/opensearch.xml">
    <meta property="og:type" content="website"/>
    <meta name="twitter:card" content="summary"/>
        <meta name="twitter:site" content="@esStackOverflow" />
    <meta name="twitter:domain" content="es.stackoverflow.com"/>
    <meta name="google-site-verification" content="uS5zRTpzXl8rRLx9W7Pd7WBcn6-f9FO4KaDi1Tyln_4"/>
    <meta name="description" content="Preguntas y respuestas para programadores y profesionales de la inform&#225;tica"/>

    <meta property="og:image" itemprop="image primaryImageOfPage" content="https://cdn.sstatic.net/Sites/es/img/apple-touch-icon@2.png?v=62634cce9d6c" />
    <meta name="twitter:title" property="og:title" itemprop="title name" content="Stack Overflow en espa&#241;ol" />
    <meta name="twitter:description" property="og:description" itemprop="description" content="Preguntas y respuestas para programadores y profesionales de la inform&#225;tica" />
    <meta property="og:url" content="https://es.stackoverflow.com/"/>
    ...