title: In tmux can I resize a pane to an absolute value
body: <p>Is it possible to tell tmux to "resize a pane to 5 lines high"?</p>
  
  <p>I know I can do <code>resize-pane -U 3</code> to move the dividing line, but sometimes when logging in with a different size monitor the size has changed by a lot of lines that I can't judge by eye.  I'd like to be able to have one command that will change one window to exactly the right number of lines rather than faffing about with multiple <code>resize-pane</code> commands.</p>