how to get values of a nested key from json file in bash using python one-liner?

Question

I'm trying to fetch values of a nested key from json file in bash using python one-liner. Below given is my json file content.

{
    "conditional_ks": {
     "saturday":["reportdata_by_type"],
     "sunday":["rt_report","metadata"]
    }
}

I want all values ["reportdata_by_type","rt_report","metadata"] as a list. I did like,

[root@testnode1 repair]# python -c "import json; print json.load(open('repair.json','r'))[\"conditional_ks\"].values()"

output: [[u'rt_report', u'metadata'], [u'reportdata_by_type']]

but i need output like ['rt_report','metadata','reportdata_by_type']

Note: repair.json is json file name.

one option is using conditional_ks.*[] which supposed to give output like:

 ["reportdata_by_type", "rt_report", "metadata" ]

But in bash i'm unable to use it.

Can anyone has solution to this, please help.

Answer 1

python -c "import json; import itertools; print(list(itertools.chain(*(json.load(open(\"repair.json\", 'r'))[\"conditional_ks\"].values()))))"

I have tested the code in my computer and it works properly. May this be helpful.

Answer 2

As always, jq is the tool of choice for working with json from a command line:

$ jq '.conditional_ks.saturday + .conditional_ks.sunday' repair.json
[
  "reportdata_by_type",
  "rt_report",
  "metadata"
]

---

Edit: If your real data has more fields than just those two specific ones and you want to concatenate all the values of conditional_ks fields, then:

$ jq '[ .conditional_ks[] ] | flatten' repair.json

will do the trick.

Answer 3

like below i solved the problem :

python -c "import json; print reduce(lambda x,y: x+y,json.load(open('repair.json','r'))[\"conditional_ks\"].values())"

output : [u'rt_report', u'metadata', u'reportdata_by_type']

Answer 4

Try follow Script. $1 is your json file, like

./MyScript.sh 'PathToYourJsonFile'

MyScript.sh:

#!/bin/bash

content=$(cat "$1");
string="";

echo "[";
while read line; do

  split=$(echo $line | sed -e 's/.*\[\(.*\)\]/\1/' | sed -s 's/",/" /g');

  for i in $split; do
    echo "$i,"
  done

done< <(echo -n "$content" | grep "\:\[");

echo "]";

Result:

[
"reportdata_by_type",
"rt_report",
"metadata",
]