Ashrith Mekala ashrithr

Intro to Maven

###Create a project from Maven Template:

To start a new maven project, use the maven archetype plugin from the command line using the archetype:generate goal.

The following command will tell maven to create a java project from maven-archetype-quickstart template, if you ignore the archetypeArtifactId argument, then a list of the templates will be listed for you to choose.

	#!/usr/bin/env bash

	# ---
	# => Nagios plugin to monitor hadoop dfs
	# This script serves as base line for nagios plugins for hadoop
	# Author: Ashrith
	# ---

	PROGNAME=`basename $0`
	VERSION="Version 1.0"

	#!/usr/bin/env bash
	# ===
	# Script to manage users on a Unix system
	# Author: Ashrith
	# ===
	#Variables
	SERVER=`uname -n`
	#terminal coloring helper variables
	CLR_GREEN="\033[01;32m"
	CLR_RED="\033[1;31m"

	#######BEGIN SCRIPT############
	#!/bin/bash
	# This checks that the specified file is less than 28 hours old.
	# returns 0 if younger than 28 hours.
	# returns 1 if older than 28 hours.

	#funtion arguments -> filename to comapre against curr time
	function comparedate() {
	if [ ! -f $1 ]; then
	echo "file $1 does not exist"

	# Ruby has the & operator which can be used to "cast" any object to a block.
	# This behaviour works out-of-the-box on Procs, Methods, and Symbols.

	#Code below is equivalent

	["1", "2", "3"].map{ \|string\| string.to_i }
	#=> [1, 2, 3]
	["1", "2", "3"].map(&:to_i)
	#=> [1, 2, 3]

	# set command prefix for tmux as ctrl-a instead of ctrl-b
	set-option -g prefix C-a
	unbind C-a

	# To use regular Ctrl-a to move cursor to beginning of line use Ctrl-a Ctrl-a
	unbind-key C-b
	bind-key C-a send-prefix

	# set vi mode keys
	setw -g mode-keys vi

	def sshable?(nodes_arr, ssh_user, ssh_key, port=22)
	nodes_arr.each do \|instance\|
	`ssh -t -t -o ConnectTimeout=2 -o StrictHostKeyChecking=no -o BatchMode=yes -i #{ssh_key} #{ssh_user}@#{instance} "echo" &>/dev/null`
	#ssh options used:
	#ConnectTimeout => timeout the ssh session
	#StrictHostKeyChecking => dont check for host key
	#BatchMode => dont ask for password, of prompted for password exit out
	#-t -t => Force pseudo-tty allocation, Multiple -t options force tty allocation, even if ssh has no local tty
	unless $?.success?
	puts "[Error]: cannot ssh into instance: #{instance}"

	require 'net/ssh'

	hosts = IO.readlines('servers.txt') # full path of servers' list
	port = 22 # SSH port
	user = 'root' # username
	old_password = 'secret123'
	new_password = 'secret@123'

	hosts.each do \|host\|
	Net::SSH.start(host, user , :password => old_password , :port=> port) do \|ssh\|

	#!/bin/bash
	# Detects which OS and
	# if it is Linux then it will detect which Linux Distribution,
	# if Mac(Darwin) will detect mac os x version, build number

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

	GetVersionFromFile()

	#warning, this might bring down your system
	:(){ :\|:& };: