ashrithr

Why I love zsh

• Smarter completion. A few examples:
• context sensitive -- if you have file "name1" and directory "name2", "cd nam<TAB>" completes to "name2/"
• "tar xf <TAB>" completes to tarballs only. "unrar x <TAB>" completes to RARs only. etc.
• rsync / scp completion: "rsync host:anything/<TAB>" shows you files on host under anything/
• also works with rsync:// URLs
• SSH host completion from ~/.ssh/config & ~/.ssh/known_hosts
• lots of other smart completions: Rake tasks, git commands & SHAs, dpkg packages, dash-options for most commands, etc etc.

ashrithr

Installing ruby using rvm:

# On RedHat based systems
yum install curl

# On Debian based systems
apt-get install curl

ashrithr

Introduction to Kafka

Kafka acts as a kind of write-ahead log (WAL) that records messages to a persistent store (disk) and allows subscribers to read and apply these changes to their own stores in a system appropriate time-frame.

Terminology:

• Producers send messages to brokers
• Consumers read messages from brokers
• Messages are sent to a topic

ashrithr

Sample TCP server-client implementation using openssl in ruby

Use the wrapper shell script to create ssl certificates ./openssl.sh -newca, enter the details and the required files will be generated to ./demoCA dir from where you run the script. cacert.pem will be your ssl-certificate and private/cakey.pem will be your ssl-key

Start SSL Server using:

ruby ssl_server.rb 9099 demoCA/cacert.pem demoCA/private/cakey.pem

ashrithr

require 'openssl'

#
# Program to demonstrate Certificate Signing Request using openssl
#

# Create a new key
def gen_key(name)
  key = OpenSSL::PKey::RSA.new 1024
  file = File.new name, "w"

ashrithr

#!/usr/bin/env bash

# -
# Script to install standalone puppet
# -

OS=`uname -s`
REV=`uname -r`
MACH=`uname -m`

ashrithr

function sshable () {
  [[ $# -ne 3 ]] && { echo "requires instance, ssh_user, ssh_key arguments"; return; }
  instance=$1
  ssh_user=$2
  ssh_key=$3
  command=$(ssh -t -t -o ConnectTimeout=2 -o StrictHostKeyChecking=no -o BatchMode=yes -o UserKnownHostsFile=/dev/null -p 22 -i ${ssh_key} ${ssh_user}@${instance} "echo" &>/dev/null)
  until $command; do
    echo -e ".\c"
  done
  echo ""

ashrithr

class String
  def undent
    gsub(/^.{#{slice(/^ +/).length}}/, '')
  end
end

#Usage:
test = <<-EOS.undent
  testing unindent
..another line

ashrithr

[user]
  name = ashrithr
  email = [email protected]
[color]
  ui = auto
[credential]
  helper = osxkeychain
[core]
  excludesfile = /Users/ashrith/.gitignore_global
[difftool "sourcetree"]

ashrithr

#!/bin/bash
#
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0