Merge pull request HarshCasper#416 from hardword/master

json file parsing with jq in bash

Author: HarshCasper

Bash/JSON_Parse_with_jq/README.md

@@ -0,0 +1,17 @@
+### json parsing in bash
+
+`find_flag.sh` sctipt will tell you how to use [jq](https://stedolan.github.io/jq/) command to parse JSON file in bash with an example (`sample.json`)
+
+The script will run below 3 commands and find the flag from the `sample.json` file
+
+```bash
+$ cat sample.json | jq "." | head -n 13
+```
+
+```bash
+$ cat sample.json | jq ".data.allPosts.edges[0:3]"
+```
+
+```bash
+$ cat sample.json | jq ".data.allPosts.edges" | grep -E -o 'RotteN{.*}' | grep -v 'harder'
+```

Bash/JSON_Parse_with_jq/find_flag.sh

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+#!/bin/bash
+
+echo "##########################################################"
+echo "### Let's check first few lines of the json file ..."
+echo "##########################################################"
+echo ""
+echo "$ cat sample.json | jq \".\" | head -n 13"
+echo ""
+echo "Press any key to continue"
+while [ true ] ; do
+read -t 3 -n 1
+if [ $? = 0 ] ; then
+cat sample.json | jq "." | head -n 13
+break
+else
+echo "..."
+fi
+done
+
+echo ""
+echo "##########################################################"
+echo "### Now analyzing a couple of node objects under edges... "
+echo "##########################################################"
+echo ""
+echo "$ cat sample.json | jq \".data.allPosts.edges[0:3]\""
+echo ""
+echo "Press any key to continue"
+while [ true ] ; do
+read -t 3 -n 1
+if [ $? = 0 ] ; then
+cat sample.json | jq ".data.allPosts.edges[0:3]"
+break
+else
+echo "..."
+fi
+done
+
+echo ""
+echo "##########################################################"
+echo "### We'll use grep to get a unique secret value..."
+echo "##########################################################"
+echo ""
+echo "$ cat sample.json | jq \".data.allPosts.edges\" | grep -E -o 'RotteN{.*}' | grep -v 'harder'"
+echo ""
+echo "Press any key to continue"
+while [ true ] ; do
+read -t 3 -n 1
+if [ $? = 0 ] ; then
+cat sample.json | jq ".data.allPosts.edges" | grep -E -o "RotteN{.*}" | grep -v "harder"
+exit
+else
+echo "..."
+fi
+done