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Studying for a Tech Interview Sucks, so Here's a Cheat Sheet to Help

This list is meant to be a both a quick guide and reference for further research into these topics. It's basically a summary of that comp sci course you never took or forgot about, so there's no way it can cover everything in depth. It also will be available as a gist on Github for everyone to edit and add to.

Data Structure Basics

###Array ####Definition:

• Stores data elements based on an sequential, most commonly 0 based, index.
• Based on tuples from set theory.

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#! python
# Record stream with python from m3u8 file in 1h parts
import time
import subprocess as sp, sys
import urllib

def record():
    sourcePath ='https://url.m3u8'
    name = '_video.ts'

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<?php

#PageController.php

public function show($slugs_string){
    $slugs = explode('/', $slugs_string);
    $page = null;
    foreach($slugs as $key => $slug){
        $page = Page::where('slug', $slug)
            ->where('parent_id', '=', is_null($page)?null:$page->id)

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# Common bandwidth hoggers and hacking tools.
map $http_user_agent $limit_bots {
    default 0;
    ~*(AltaVista|Slurp|BlackWidow|Bot|ChinaClaw|Custo|DISCo|Download|Demon|eCatch|EirGrabber|EmailSiphon|EmailWolf|SuperHTTP|Surfbot|WebWhacker) 1;
    ~*(Express|WebPictures|ExtractorPro|EyeNetIE|FlashGet|GetRight|GetWeb!|Go!Zilla|Go-Ahead-Got-It|GrabNet|Grafula|HMView|Go!Zilla|Go-Ahead-Got-It) 1;
     ~*(rafula|HMView|HTTrack|Stripper|Sucker|Indy|InterGET|Ninja|JetCar|Spider|larbin|LeechFTP|Downloader|tool|Navroad|NearSite|NetAnts|tAkeOut|WWWOFFLE) 1;
    ~*(GrabNet|NetSpider|Vampire|NetZIP|Octopus|Offline|PageGrabber|Foto|pavuk|pcBrowser|RealDownload|ReGet|SiteSnagger|SmartDownload|SuperBot|WebSpider) 1;
    ~*(Teleport|VoidEYE|Collector|WebAuto|WebCopier|WebFetch|WebGo|WebLeacher|WebReaper|WebSauger|eXtractor|Quester|WebStripper|WebZIP|Wget|Widow|Zeus) 1;
    ~*(Twengabot|htmlparser|libwww|Python|perl|urllib|scan|Curl|email|PycURL|Pyth|PyQ|WebCollector|WebCopy|webcraw) 1;
} 

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#ifdef DEBUG
#define DEBUG_MSG(str) do { std::cout << str << std::endl; } while( false )
#else
#define DEBUG_MSG(str) do { } while ( false )
#endif

int main()
{
    DEBUG_MSG("Hello" << ' ' << "World!" << 1 );
    return 0;

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 #!/bin/bash
# Execute it as root, due to archiving permision conflicts
#CRONTAB entry for every day at 04:00 AM
#0 4 * * * /usr/local/bin/webserver-backup.sh >/dev/null 2>&1

# DATABSE DATA
DB_USER="XXX"
DB_PASSWORD="XXX"

# PATH'S

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#!/bin/bash
# This bash script exports all mysql databases and archives it with all webserver files.
# Created archive will be encrypted with gpg key.
# After sending to cloud storage all created files will be deleted
# This script uses: tar, gpg, mysql and aws3 s3
# ** IMPORTANT** : 
#            ** You need to have generated gpg key !!! Otherwise comment encryption part.
#            ** Execute this script with proper rights. It means that if in webserver dir
#            you have files with permisions only for root user, then use sudo.

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Check what process is using a port

netstat -tulpn | grep 80

Search in 'path' for 'pattern' in files

grep -rnw 'path' -e 'pattern'

Search in 'to/path' for file 'pattern'

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<?php
/**
Send message to slack channel.
$hook can be created at https://mindau.slack.com/apps/A0F7XDUAZ-incoming-webhook
*/
function sendLog($title, $msg)
{
    $hook        = "https://hooks.slack.com/services/XXXXXXXXXXXXXXXXXXXXXXXXXXXXXX";
    $data = array(
        'channel'    => '#logging',

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// ==UserScript==
// @name     Unnamed Script 760860
// @version  1
// @grant    GM.xmlHttpRequest
// get all players who sent reinforcement
// ==/UserScript==

(async () => {  
    const rows = [...document.querySelectorAll('#overview > tbody > tr')];
    const thisPlayer = document.getElementsByClassName('playerName')[0].childNodes[3].innerHTML;