title: How to remove trailing and leading whitespace for user-provided input in a batch file?
body: <p>I know how to do this when the variable is pre-defined. However, when asking for the user to enter in some kind of input, how do I trim leading and trailing whitespace? This is what I have so far:</p>
  
  <pre><code>@echo off
  
  set /p input=:
  echo. The input is %input% before
  
  ::trim left whitespace
  for /f "tokens=* delims= " %%a in ("%input%") do set input=%%a
  ::trim right whitespace (up to 100 spaces at the end)
  for /l %%a in (1,1,100) do if "!input:~-1!"==" " set input=!input:~0,-1! 
  
  echo. The input is %input% after
  
  pause
  </code></pre>