Simple script that extracts the value for a given key within a JSON output.

jgrep.sh

#!/bin/sh
## Takes an input pipe of JSON, and outputs the value for a given key.

set -e

usage() {
  printf "
  Takes an input pipe of JSON, and outputs the value for a given key. \n
  Usage: some_JSON_output | jgrep key \n
  "
}

## If argument empty or help, display help message.
if [ -z "$1" ] || [ "$1" = "--help" ]; then usage && exit 0; fi

## Grep the key from the JSON input, then sanitize.
grep $1 | awk '{print $2}' | tr -d ',"' < /dev/stdin