如果父鍵在 json 文件中匹配，SED/AWK 如何替換值

Question

如果父項是 refreshinterval，我正在嘗試替換默認值。我嘗試使用 jq 和 sed 但無法獲得我預期的 output。有人可以幫助獲得預期的答案。

{ "doubleClickDiff": {
        "type": "boolean",
        "title": "Show diff on double click",
        "description": "If true, doubling clicking a file in the list of changed files will open a diff.",
        "default": false
      },
      "historyCount": {
        "type": "integer",
        "title": "History count",
        "description": "Number of (most recent) commits shown in the history log",
        "default": 25
      },
      "refreshInterval": {
        "type": "integer",
        "title": "Refresh interval",
        "description": "Number of milliseconds between polling the file system for changes.",
        "default": 10000
      },
      "simpleStaging": {
        "type": "boolean",
        "title": "Simple staging flag",
        "description": "If true, use a simplified concept of staging. Only files with changes are shown (instead of showing staged/changed/untracked), and all files with changes will be automatically staged",
        "default": false
      }}

我的 output 應該僅在鍵為 refreshInterval 時才替換默認值

"refreshInterval": {
        "type": "integer",
        "title": "Refresh interval",
        "description": "Number of milliseconds between polling the file system for changes.",
        "default": 40000
      },



jq '."refreshInterval"."default"=40000' plugin.json

sed -i 's/\"default\":.*/\"default\": '40000'/g' "demo.json"

Answer 1

您發布的jq命令應該可以正常工作，但它不會更新文件，它只會輸出更新后的結果。 您可以存儲該 output 並用它覆蓋原始文件，如下所示：

jq '.refreshInterval.default = 40000' plugin.json > jq_output
mv jq_output plugin.json

注意不要嘗試將其簡化為jq '.refreshInterval.default = 40000' plugin.json > plugin.json因為將首先處理重定向並在jq讀取文件之前擦除文件的內容。 如果你想避免使用臨時文件，你可以使用一個實用程序，例如moreutils package 中的sponge ，它允許就地編輯。