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Processing JSON using jq

jq is useful to slice, filter, map and transform structured json data.

Installing jq

On Mac OS

brew install jq

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JQ to filter JSON by value

Syntax: cat <filename> | jq -c '.[] | select( .<key> | contains("<value>"))'

Example: To get json record having _id equal 611

cat my.json | jq -c '.[] | select( ._id | contains(611))'

Remember: if JSON value has no double quotes (eg. for numeric) to do not supply in filter i.e. in contains(611)

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Linux NetFilter, IP Tables and Conntrack Diagrams

IPTABLES TABLES and CHAINS

IPTables has the following 4 built-in tables.

1) Filter Table

Filter is default table for iptables. So, if you don’t define you own table, you’ll be using filter table. Iptables’s filter table has the following built-in chains.

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// keepDoingSomething will keep trying to doSomething() until either
// we get a result from doSomething() or the timeout expires
func keepDoingSomething() (bool, error) {
	timeout := time.After(5 * time.Second)
	tick := time.Tick(500 * time.Millisecond)
	// Keep trying until we're timed out or got a result or got an error
	for {
		select {
		// Got a timeout! fail with a timeout error
		case <-timeout:

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package main

import (
	"log"
	"net/smtp"
)

func main() {
	send("hello there")
}

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#!/usr/bin/python
#This script does the basic security check.
#It checks 
#1.the server hosting, that is, if any server is hosted in VPC Classic, 
#2.if there is any security group which has ports opened for all.
#3.are all IAM keys rotated in 90 days
#4.if MFA is enabled on each user of an account
#5.if Cloudtrail is enabled in all regions
#6.if any s3 bucket has open permissions

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#!/usr/bin/python
#This script does the basic security check.
#It checks 
#1.the server hosting, that is, if any server is hosted in VPC Classic, 
#2.if there is any security group which has ports opened for all.
#3.are all IAM keys rotated in 90 days
#4.if MFA is enabled on each user of an account
#5.if Cloudtrail is enabled in all regions
#6.if any s3 bucket has open permissions

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package main

import (
	"fmt"
	"sync"
)

/*
This solution uses channels to force each gorountines to wait for its child gorountines to exit.
*/

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package main

import (
	"bufio"
	"fmt"
	"io"
	"log"
	"os"
	"path"
	"strings"

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AWS Golang SDK examples