title: syntax error in expression (error token is "1") bash script
body: <p>I am getting a syntax error when I try to test the following and it appears to be due to the 0 which is there.   What am I missing here?  </p>
  
  <p>This is the code:</p>
  
  <pre><code>echo =========================================
  echo sum of 4 arguments:"$requestedsum"
  if [ -n "$requestedsum" ]
  then 
  (( $(echo "$requestedsum &gt; $vg_free_space" |bc)));
  echo "Requested space is not available in VG";
  else
  echo "Requested space is available";
  fi
  
  
  =========================================
  sum of 4 arguments:0
  10
  ./sizecheck.sh: line 26: ((: 0
  1: syntax error in expression (error token is "1")
  Requested space is not available in VG
  </code></pre>