title: ZSH iterm2 increase number of lines history
body: <p>Not sure if this is zsh, iterm2 or the interaction between them.
  Trying to change the number of recallable lines in the terminal - not the command history, the output history.</p>
  
  <p>In .zshrc I have :</p>
  
  <pre><code>HISTFILE=~/.histfile
  HISTSIZE=100000
  SAVEHIST=100000
  </code></pre>
  
  <p>This seems to be ignored =(</p>
  
  <p>Not sure of the correct term to google, "Terminal output history?"</p>