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Ubuntu – Access a JSON key from env variable

Im using ubuntu to store JSON-encoded text into a environment variable like this:

~ test='{"test": { "mmm":"432"}}'
~ echo $test
{"test": { "mmm":"432"}}

how can i access the key "test" to print {"mmm":"432"}?

something like

~ test='{"test": { "mmm":"432"}}'
~ echo $test.test
{ "mmm":"432"}
Tags:

3

Answers


  1. 0

    Bash doesn’t have json support. You must use a command line jq to process the output.

    For example:

    echo "$test" | jq .test

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  2. 0

    https://jqlang.github.io/jq/ is your friend.

    Simply use echo "$test" | jq .test.

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  3. 0

    If $test is really an (exported) "environment variable", you can use jq’s env or $ENV builtins to access it, avoiding the echo subshell:

    jq -n 'env.test | fromjson.test'
# or
jq -n '$ENV.test | fromjson.test'
# or
jq -n 'env["test"] | fromjson.test'
# or
jq -n '$ENV["test"] | fromjson.test'

    {
  "mmm": "432"
}
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