I have some json data which looks like below:
{"spark.master": "local"}
I have this stored in a shell variable called json_data
json_data='{"spark.master": "local"}'
and parsing this using the jq shell utility.
As seen above, the key contains a period (.) character. If I try to read it directly using jq, it works fine
$ json_data='{"spark.master": "local"}'
$ val=$(echo $json_data | jq .'"spark.master"')
$ echo $val
"local"
But if this key is stored in a variable, its not working
$ key="spark.master"
$ val=$(echo $json_data | jq .'$key')
jq: error: syntax error, unexpected '$' (Unix shell quoting issues?) at <top-level>, line 1:
.$key
jq: error: try .["field"] instead of .field for unusually named fields at <top-level>, line 1:
.$key
jq: 2 compile errors
$ val=$(echo $json_data | jq ."$key")
$ echo $val
null
Can someone please help me identify what is going wrong here?
