gistfile1.txt

    // list a directory 
    {
        command: 'ls',
        arguments: [
            {'uri': '/home/dunk/*.json'}
        ]
    }

    // list a directory and grep the returned files for foo 
    {
        command: 'ls',
        arguments: [
           {'uri': '/home/dunk/*.json'}
        ],
        stdout: {
            command: 'grep',
            arguments: [
                {'regexp': 'foo'}
            ]
        }
    }

    // list a directory and cp all files to the same name + '.bak'
    {
        command: 'ls',
        arguments: [
            {'uri': '/home/dunk/*.json'},
        ],
        stdout: { 
            command: 'cp',
            arguments: [ 
                {'stdin': '.filename'},
                {'stdin': {expr: '.filename+".bak"'}}
            ]
        }
    }