title: shell: build variable with multiple paths and commands
body: <p>Is there a way to build a varible like this:</p>
  
  <pre><code>var="-i \"/path to/file 1.mp4\" -i \"/path to/file 2.mp4\""
  </code></pre>
  
  <p>And then use this later in a program:</p>
  
  <pre><code>ffmpeg $var
  </code></pre>
  
  <p>I know <code>\"</code> doesn't work, and <code>eval</code> works in a way, but eval can be ugly. </p>
  
  <p>Is there a solution without eval? </p>