title: If condition is not equal batch file crashes
body: <p>I have been writing some batch files now-a-days. I am beginner !. So i have made a custom batch in which by entering a setup name it launches it but. I'am having some problem creating this custom file.</p>
  
  <pre><code>    @echo off
  set /p lnk="Setup Name = "
  if "%lnk%"=="install.itunes.x64.windows" goto itunes
  :itunes
  start=(path)(setup.exe).....
  cls
  </code></pre>
  
  <p>But if a user enters "itues or "installitunes" or "KJEWBFciou" whatever that don't matchs my custom command I want a error Pop-up in this condition. 
  What can i Do?
  and don't ask to put <code>"if not "%lnk%"</code> i have already tried help level:0
  Because i have many setups like itunes if input will not equal to custom command it launches the next setup.
  Please help me</p>
  
  <p>Please igonre my errors i only made 'em here not in batch file.
  in line 2 %lnk%   , lnk
  and line 3  "%lnk"   ,"%lnk%"</p>