gren [flags] <source>

  -f <regex>   filter flattened json by specified regex
  -g <path>    get value in JSON at specified path
  -u           unflatten output - display JSON

$ gren package.json -f 'de(vDe)?pendencies'
json.dependencies = {};
json.dependencies["json-colorizer"] = "^1.1.0";
json.dependencies.bent = "^1.1.0";
json.dependencies.chalk = "^2.3.2";
json.dependencies.lodash = "^4.17.5";
json.dependencies.minimist = "^1.2.0";
json.devDependencies = {};
json.devDependencies.jest = "^22.4.3";

$ gren package.json -f gren
json.bin.gren = "bin/gren";
json.main = "bin/gren";
json.name = "gren";

$  gren package.json -f gren -u
{
  "bin": {
    "gren": "bin/gren"
  },
  "main": "bin/gren",
  "name": "gren"
}

$ gren package.json -g version
0.0.1

$ gren package.json -g bin.gren
bin/gren