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How to add .service file in Ubuntu?

1. Write the my-server.service file name with the following content:

[Unit]
Description=Some description about the app.

[Service]
User=www-data

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Netcat cheatsheet

• Netcat listening on port 567/TCP:

$ nc -l 567

• Connecting to that port from another machine:

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Row ID,Order ID,Order Date,Ship Date,Ship Mode,Customer ID,Customer Name,Segment,Country/Region,City,State,Postal Code,Region,Product ID,Category,Sub-Category,Product Name,Sales,Quantity,Discount,Profit
1,CA-2019-152156,11/8/2019,11/11/2019,Second Class,CG-12520,Claire Gute,Consumer,United States,Henderson,Kentucky,42420,South,FUR-BO-10001798,Furniture,Bookcases,Bush Somerset Collection Bookcase,261.96,2,0,41.9136
2,CA-2019-152156,11/8/2019,11/11/2019,Second Class,CG-12520,Claire Gute,Consumer,United States,Henderson,Kentucky,42420,South,FUR-CH-10000454,Furniture,Chairs,"Hon Deluxe Fabric Upholstered Stacking Chairs, Rounded Back",731.94,3,0,219.582
3,CA-2019-138688,6/12/2019,6/16/2019,Second Class,DV-13045,Darrin Van Huff,Corporate,United States,Los Angeles,California,90036,West,OFF-LA-10000240,Office Supplies,Labels,Self-Adhesive Address Labels for Typewriters by Universal,14.62,2,0,6.8714
4,US-2018-108966,10/11/2018,10/18/2018,Standard Class,SO-20335,Sean O'Donnell,Consumer,United States,Fort Lauderdale,Fl

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{"lastUpload":"2022-01-17T19:15:58.179Z","extensionVersion":"v3.4.3"}

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document.addEventListener("keypress", (evt) => {
    if (evt.ctrlKey && evt.keyCode === 19) {
        console.log("Subtitle shortcut triggered");

        const btn = document.querySelector(".button-nfplayerSubtitles");
        if (!btn) {
            return;
        }
        
        const parent = btn.parentElement;

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CoinMarketCap Extra Actions

It will add extra actions to CoinMarketCap.com website and it helps to view the coin information in same window.

const EXTRA_ACTIONS_CLASSNAME = "coin-extra-actions";
const POPUP_CONTAINER_CLASSNAME = "coin-extra-popup-container";
const renderChanges = () => {
  const coinElems = document.querySelectorAll(".sc-16r8icm-0.escjiH");
  [...coinElems].forEach((coinElem) => {
    if (!coinElem.querySelector(`.${EXTRA_ACTIONS_CLASSNAME}`)) {

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How to execute the .bashrc file with command running through SSH login?

I wanted to use command

ssh myhost.com 'some_command' and some_command exists in /var/some_location so I tried to append /var/some_location in $PATH environment by editing $HOME/.bashrc

but that wasn't working. because default .bashrc(Ubuntu 10.4 LTS) prevent from sourcing by code like below:

# If not running interactively, don't do anything

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Algorithms to solve a 3x3 rubiks cube

Algorithms:
1. The Righty Alg: R U Ri Ui
2. The Lefty Alg: Li Ui L U
3. Spin Right: rotote whole cube by 90deg in closewise
4. Spin Left: rotote whole cube by 90deg in anti-closewise

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Install Nginx and Let's Encrypt on fresh VPS

/etc/systemd/system/neo.service

• After creating a fresh VPS instance, Run:

$ sudo apt-get update && apt-get upgrade

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Solution: sum(1)(2)(3)(10)() = 16

1. Solution 1: Cache the value in the function itself. But, It will not work when the function is called multiple times at the same time.

function sumAggr(num) {
  if (sumAggr.sum === undefined) {
 sumAggr.sum = 0;