title: Bash 'yes a' and 'yes b'
body: <pre><code>bash: $: yes a
  [some output] then press Ctrl+Z
        $: yes b
  [some output] then press Ctrl+Z
  </code></pre>
  
  <p>then, do bg twice and got some output:</p>
  
  <blockquote>
    <p>a b b b a a a a b a a a a b b a b a a a a a b a a a b a a b  a a ... a
    b b b b b b b b etc.</p>
  </blockquote>
  
  <p>Why a and b interchange so casually?</p>