root/galaxy-central/tools/filters/commWrapper.xml

<tool id="Comm1" name="Find Similarities and Differences">
  <description>between two queries</description>
  <command interpreter="perl">commWrapper.pl $input1 $input2 $mode $out_file1</command>
  <inputs>
    <param format="tabular" name="input1" type="data" label="Compare Query1"/>
    <param format="tabular" name="input2" type="data" label="with Query2"/>
    <param name="mode" type="select" label="And find">
      <option value="-23">Lines unique to Query1</option>
      <option value="-12">Lines shared between Query1 and Query2</option>
    </param>
  </inputs>
  <outputs>
    <data format="input" name="out_file1" metadata_source="input1" />
  </outputs>
  <help>
This tool is based on UNIX shell command comm. It compares two queries and returns similarities or differences. For example, if you have two queries::
  
 a  1
 b  2
 c  3

and::

 a  1
 f  6
 h  8

Using this tool with **Lines unique to Query1** option will return::

 b  2
 c  3

If you use **Lines shared between Query1 and Query2** option output will look like this::

 a  1

</help>
</tool>