title: Pip install argument from unix pipe
body: <p>I intend to create a script able to install one single wheel file (.whl) at my enviroment using pip, but the file wheel file change the version very frequent. Ex: For now the file name is 
   Simulador-0.3.2.post0.dev2+g862e34a.dirty-py2.py3-none-any.whl
  but soon will be ..-0.3.3- ....</p>
  
  <p>For install this version I can try to do this
  <code>pip install Simulador-0.3.2.post0.dev2+g862e34a.dirty-py2.py3-none-any.whl</code></p>
  
  <p>but this solution will stop to work as soon my version change, so I tried to create a ubuntu pipe</p>
  
  <p><code>ls *.whl | pip install</code></p>
  
  <p>But didn't work, show this message
  "ERROR: You must give at least one requirement to install (see "pip help install")" But don`t make sense, because the ls *.whl is sending a argument.</p>
  
  <p>Any suggestion to fix the pipe?</p>