如何使用jq复制JSON数组中的现有对象？

米克斯

我有以下geojson文件：

{
    "type": "FeatureCollection",
    "features": [{
            "type": "Feature",
            "properties": {
                "LINE": "RED",
                "STATION": "Harvard"
            },
            "geometry": {
                "type": "Point",
                "coordinates": [-71.118906072378209, 42.37402923068516]
            }
        },
        {
            "type": "Feature",
            "properties": {
                "LINE": "RED",
                "STATION": "Ashmont"
            },
            "geometry": {
                "type": "Point",
                "coordinates": [-71.063430144389983, 42.283883546225319]
            }
        }
    ]
}

我想将“功能”数组内的第二个对象附加到它的末尾，创建总共3个对象。使用以下代码段错误，将“数组（[{“ type”：“ F ...）和对象（{” type“：” Fe ...）添加在一起”。有没有办法做到这一点使用JQ没有硬编码的关键是：值对，看到这里？

cat red_line_nodes.json | jq '.features |= . + .[length-1]' > red_line_nodes_2.json

罗曼·佩列赫雷斯特

简短的jq解决方案：

jq '.features |= . + [.[-1]]' red_line_nodes.json

输出：

{
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "properties": {
        "LINE": "RED",
        "STATION": "Harvard"
      },
      "geometry": {
        "type": "Point",
        "coordinates": [
          -71.11890607237821,
          42.37402923068516
        ]
      }
    },
    {
      "type": "Feature",
      "properties": {
        "LINE": "RED",
        "STATION": "Ashmont"
      },
      "geometry": {
        "type": "Point",
        "coordinates": [
          -71.06343014438998,
          42.28388354622532
        ]
      }
    },
    {
      "type": "Feature",
      "properties": {
        "LINE": "RED",
        "STATION": "Ashmont"
      },
      "geometry": {
        "type": "Point",
        "coordinates": [
          -71.06343014438998,
          42.28388354622532
        ]
      }
    }
  ]
}

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