How to use bash script that parses json data from a file?

To parse JSON data in a bash script, you would typically use a command line tool such as 'jq'. jq is a command-line JSON processor. It's very powerful and easy to use for extracting data from JSON documents. Here is a basic script that would extract data from a JSON file:

#!/bin/bash
# My sample JSON file is named data.json, and I want to get the value of key named 'name'
JSON_FILE='data.json'
JSON_KEY='name'

DATA="$(jq -r ".$JSON_KEY" $JSON_FILE)"

echo $DATA

In this script, jq takes two arguments. The first argument (-r ".$JSON_KEY") is a filter that tells jq what to do with the input it receives. The ".$JSON_KEY" part of the filter will extract the value of JSON_KEY from the input JSON. The -r option tells jq to output raw strings instead of JSON-encoded strings.

The second argument is the name of the JSON file you want to parse. The values read from the JSON file is then stored in the DATA variable and then that data is printed out with echo.

To install jq, you can use package managers like apt for Ubuntu:

sudo apt-get install jq

Or brew for MacOS:

brew install jq

Note: JSON data and key are hypothetical and you would replace them with your actual JSON data and keys.

Resource:

• JQ documentation: https://stedolan.github.io/jq/manual/