grep in CWL and json (non CWL)

grep.json

{
  "name": "grep",
  "tool-version": "2.21",
  "description": "Linux grep tool.",
  "command-line": "grep [IGNORE_CASE] [MAX_COUNT] [PATTERN] [FILE] > [STDOUT]",
  "docker-image": "ubuntu",
  "docker-index": "http://index.docker.io",
  "schema-version": "0.2",
  "inputs": [
    {
      "id": "ignore_case_flag",
      "name": "Ignore case",
      "type": "Flag",
      "description": "Ignore case distinctions in both the PATTERN and the input files.",
      "command-line-key": "[IGNORE_CASE]",
      "optional": true,
      "command-line-flag": "-i"
    },
    {
      "id": "max_count",
      "name": "Max count",
      "type": "Number",
      "description": "Stop  reading  a  file  after MAX_COUNT matching lines.",
      "command-line-key": "[MAX_COUNT]",
      "optional": true,
      "command-line-flag": "-m"
    },
    {
      "id": "pattern",
      "name": "Pattern",
      "type": "String",
      "description": "Pattern to search for.",
      "command-line-key": "[PATTERN]"
    },
    {
      "id": "file",
      "name": "Input file",
      "type": "File",
      "description": "Input file",
      "command-line-key": "[FILE]",
      "command-line-flag": ""
    }
  ],
  "output-files": [
    {
      "id": "stdout",
      "name": "Standard output",
      "description": "Standard output",
      "command-line-key": "[STDOUT]",
      "path-template": "output.txt"
    }
  ]
}

grep.yaml

#!/usr/bin/env cwl-runner

$namespaces:
  doap: http://usefulinc.com/ns/doap#

cwlVersion: "cwl:draft-3.dev3"

class: CommandLineTool

adms:includedAsset:
  doap:name: "grep"
  doap:release:
  - class: doap:Version
    doap:revision: "2.21"

description: |
  Linux grep tool.

requirements:
  - class: DockerRequirement
    dockerImageId: ubuntu
    
inputs:
  - id: "ignore_case_flag"
    label: "Ignore case"
    type: "boolean"
    description: "Ignore case distinctions in both the PATTERN and the input files."
    inputBinding:
      position: 1
      prefix: "-i"

  - id: "max_count"
    label: "Max count"
    type: "int"
    description: "Stop  reading  a  file  after MAX_COUNT matching lines."
    inputBinding:
      position: 2
      prefix: "-m"

  - id: "pattern"
    label: "Pattern"
    type: "string"
    description: "Pattern to search for."
    inputBinding:
      position: 3

  - id: "file"
    label: "Input file"
    type: File
    description: "Input file"
    inputBinding:
      position: 4

outputs:
  - id: "stdout"
    type: File
    description: "Standard output"
    outputBinding:
      glob: "output.txt"

stdout: "output.txt"

baseCommand: ["grep"]