title: Variables in wget post data
body: <p>I am working on a simple bash script to download images from the website Tumblr. The idea is to use <code>read</code> to get login info from the user, and <code>wget --post-data</code> to log in, and this is what I have:</p>
  
  <pre><code>read -p "Tumblr login email: " EMAIL
  read -p "Tumblr login password: " PASSWRD
  wget --user-agent=Mozilla/5.0 --save-cookies cookies.txt --post-data 'email=$EMAIL&amp;password=$PASSWRD' --no-check-certificate https://www.tumblr.com/login
  </code></pre>
  
  <p>However, it is sending <code>"$EMAIL"</code> and <code>"$PASSWRD"</code> instead of the strings for the variables, is there any way to get it to send values that have been inputted by the user?</p>