title: CVS - Cannot exec rsh error
body: <p>I am trying to use <code>C-x v =</code> to compare my current buffer with the repository file. But it gives error:</p>
  
  <pre><code> cvs [diff aborted]: cannot exec rsh: No such file or directory
   cvs [diff aborted]: end of file from server (consult above messages if any)
  </code></pre>
  
  <p>Yes, I haven't installed rsh. But I already set CVS_RSH to ssh. Is there any other set I could change to let me use ssh instead of rsh when working in emacs with cvs?</p>
  
  <p>By the way, I can't run any CVS commands under emacs, which are run very well in termial. Here are the cvs related setup in my login bash script:</p>
  
  <pre><code> 81 CVSROOT=zane@dda.uxmc.edu:/home/cvs
   82 CVS_SERVER=/usr/bin/cvs
   83 CVS_RSH=ssh
   84 export CVSROOT
   85 export CVS_SERVER
   86 export CVS_RSH
  </code></pre>