jq 列印子對像中所有的鍵和值

我找到了這個Q/A以及列印對像中所有鍵的解決方案：

jq -r 'keys[] as $k | "\($k), \(.[$k] | .ip)"' 

就我而言，我想在子對像上執行上述操作：

jq -r '.connections keys[] as $k | "\($k), \(.[$k] | .ip)"'

執行此操作的正確語法是什麼？

只需管道即可keys執行：

樣品input.json：

{
   "connections": {
       "host1": { "ip": "10.1.2.3" },
       "host2": { "ip": "10.1.2.2" },
       "host3": { "ip": "10.1.18.1" }
   }
}

---

jq -r '.connections | keys[] as $k | "\($k), \(.[$k] | .ip)"' input.json

輸出：

host1, 10.1.2.3
host2, 10.1.2.2
host3, 10.1.18.1

一個更通用的 bash 函式來導出變數（帶插值）：

#
#------------------------------------------------------------------------------
# usage example:
# doExportJsonSectionVars cnf/env/dev.env.json '.env.virtual.docker.spark_base'
#------------------------------------------------------------------------------
doExportJsonSectionVars(){

  json_file="$1"
  shift 1;
  test -f "$json_file" || echo "the json_file: $json_file does not exist !!! Nothing to do" && exit 1

  section="$1"
  test -z "$section" && echo "the section in doExportJsonSectionVars is empty !!! nothing to do !!!" && exit 1
  shift 1;

  while read -r l ; do
     eval $l ;
  done < <(cat "$json_file"| jq -r "$section"'|keys_unsorted[] as $key|"export \($key)=\(.[$key])"')
}

範例數據

cat cnf/env/dev.env.json
{
 "env": {
   "ENV_TYPE": "dev",
     "physical": {
       "var_name": "var_value"
     },
     "virtual": {
         "docker": {
           "spark_base": {
               "SPARK_HOME": "/opt/spark"
             , "SPARK_CONF": "$SPARK_HOME/conf"
           }
           , "spark_master": {
             "var_name": "var_value"
           }
           , "spark_worker": {
             "var_name": "var_value"
           }
         }
         , "var_name": "var_value"
     }
 }
}

引用自：https://unix.stackexchange.com/questions/406410