title: KornShell Error 0403-004 Specify a parameter with this command
body: <p>This KornShell code is throwing the following error:</p>
  
  <p><strong>test.ksh</strong></p>
  
  <pre><code>#! /usr/bin/ksh
  
  if [ ${fooVariable} = "" ]; then
      fooVariable="fooString"
  fi
  
  echo "${fooVariable}"
  </code></pre>
  
  <p><strong>Error:</strong></p>
  
  <pre><code>@:/tmp #./test.ksh
  ./test.ksh[3]: test: 0403-004 Specify a parameter with this command.
  </code></pre>
  
  <p>Why is this error being thrown and how to fix it?</p>