The invocation of [VarDictJava][1] in paired variant calling mode is 

    VarDict -b "/path/to/tumor.bam|/path/to/normal.bam"

Now obviously in my CWL I would like the tumour and normal BAM to be separate inputs. However, I'm not sure how to combine these into a single command line argument in the actual CommandLineBinding

  [1]: https://github.com/AstraZeneca-NGS/VarDictJava#paired-variant-calling
Hello @ttmigueltt,

Here's an alternative solution if you will always have both samples; no `InlineJavascriptRequirement` needed:

    cwlVersion: v1.0
    class: CommandLineTool
    
    inputs:
      normal:
        type: File
        format: edam:format_2572
      tumor
        type: File
        format: edam:format_2572
    
    baseCommand: echo
    
    arguments:
      - $(inputs.bam_input.path)|$(inputs.bam_input.path)
    
    outputs: []
    
    $namespaces: { edam: http://edamontology.org/ }
    $schemas: [ http://edamontology.org/EDAM_1.20.owl ]