galaxy_test_tool.xml

<tool id="will_add" name="Example/Explainer tool" version="0.0.1">
    <description>Add string to dataset</description>
    <command interpreter="/projects/galaxy/tools/cba/p3env/bin/python">
    galaxy_test_tool.py  -f $input1 -s $s > $out_file1
    </command>

 <inputs>
    <param format="txt" name="input1" type="data" label="Select lines from"/>
    <param format="txt" name="s" type="text" value=""  label="String to Add" />

    
</inputs>
    <outputs>
        <data name="out_file1" format="input" metadata_source="input1"/>
    </outputs>

    <help>


**What it does**
Add string to dataset

</help>
</tool>