sasajib

#!/bin/bash

parse_time() {
    IFS=' ' read -ra PART <<< "$1"
	seconds=0
    for i in "${PART[@]}"; do
		number=$(expr match $i '\([0-9]\+\)')
		unit=$(expr match $i '[0-9]*\([a-z]\+\)')
		case $unit in
			h)

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A Relatively Secure Server Stack Setup in Ubuntu 16.04 LTS

Anup Dhakal

Sagar Chamling

Introduction

In this guide, LEPP stands for Linux, Nginx (pronounced as Engine-X) , Postgres and PHP (PHP Hypertext Preprocessor).

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Safest way to clean up boot partition - Ubuntu 14.04LTS-x64

Reference

Case I: if /boot is not 100% full and apt is working

1. Check the current kernel version

$ uname -r 

sasajib

#!/bin/bash
aria2c -j5 -i list.txt -c --save-session out.txt
has_error=`wc -l < out.txt`

while [ $has_error -gt 0 ]
do
  echo "still has $has_error errors, rerun aria2 to download ..."
  aria2c -j5 -i list.txt -c --save-session out.txt
  has_error=`wc -l < out.txt`
  sleep 10

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//[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17] => [[1, 2, 3], [4, 5, 6], [7, 8, 9], [10, 11, 12], [13, 14, 15], [16, 17]]
function grouped(arr, limit){
 return arr.map((data, index) => {
   return index % limit === 0 ? arr.slice(index, index + limit) : null; 
 }).filter((item) => { return item; })
}

//range crete [0,1,2,3,4...number]
function range(number){
 return Array.from(new Array(number), (x,i) => i)

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# Based on:
# http://www.zackarychapple.guru/chrome/2016/08/24/chrome-headless.html
# https://www.chromium.org/developers/how-tos/get-the-code
# https://chromium.googlesource.com/chromium/src/+/lkgr/headless/README.md

apt-get update
apt-get install -y curl git htop man unzip vim wget python
git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
export PATH=$PATH:`pwd`/depot_tools
mkdir Chromium && cd Chromium

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# E.g. TaskClass = CaseClass('name', 'owner', 'pid')
# task1 = TaskClass(name = "hello", owner = "brian", pid = 15)
# task2 = TaskClass(name = "world", owner = "brian", pid = 13)
# tasks = [task1, task2]
# 
# filter(lambda task: task.where(owner = "brian"), tasks) => [task1, task2]
# filter(lambda task: task.where(owner = "brian", pid = 13), tasks) => [task2]
# 
# matcher = TaskClass(pid = 13)
# filter(lambda task: task.match(matcher), tasks) => [task2]

sasajib

import akka.actor._
import akka.stream.scaladsl.Flow
import org.apache.spark.streaming.dstream.ReceiverInputDStream
import org.apache.spark.streaming.receiver.ActorHelper
import akka.actor.{ ExtensionKey, Extension, ExtendedActorSystem }

import scala.reflect.ClassTag

object AkkaStreamSparkIntegration {

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package tech.webstar.utils
import scala.collection.mutable

/**
  * @author sasajib
  */
trait BoundedQueue[A] extends mutable.Queue[A] {
    def maxSize: Int

    override def +=(a: A): this.type = {

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import scala.collection.mutable

/**
 * Bounded priority queue trait that is intended to be mixed into instances of
 * scala.collection.mutable.PriorityQueue. By default PriorityQueue instances in
 * Scala are unbounded. This trait modifies the original PriorityQueue's
 * enqueue methods such that we only retain the top K elements.
 * The top K elements are defined by an implicit Ordering[A].
 * @author Ryan LeCompte ([email protected])
 */