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Ubuntu Command Cheatsheet

General usage ubuntu comments. Separated in general and development related.

General

General scope useful commands

• Sync VM machine time

sudo ntpdate ntp.ubuntu.com

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Docker Development

Short gist with Node development using Docker.

Effimeral container (with bash)

Span a Node docker container and connect into it.

Features

• Mount bolume that will be removed on leave: -it --rm

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JS Decorators in React

Short practical guide to clarify the use cases of Decorators (aka HOF) and High Order Components. The examples is applicable for general JS, but are contructed using ES2015 + React.

Higher Order Functions and Higher Order Components

Higher Order Functions (HOF) are functions that receive functions as arguments (Inception :/) and return functions. They operate over functions instead of "simple" variables. Decorators provide syntactic suggar for implementing HOFs JS, to modify and extend passed functions.

Higher Order Components (HOC) are a React specific patter, very much similar to the aforemntioned HOF. Instead of receiving functions as argumnets, Components are passed. They are especially useful to add stateful wrappers to componets and alter livecycle

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; Global settings for redshift
[redshift]
; Set the day and night screen temperatures
temp-day=5300
temp-night=3500

; Enable/Disable a smooth transition between day and night
; 0 will cause a direct change from day to night screen temperature.
; 1 will gradually increase or decrease the screen temperature.
transition=1

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Hotkeys

Save to file

dconf dump /org/gnome/desktop/wm/keybindings/ > keybindings.dconf

Load from file

dconf load /org/gnome/desktop/wm/keybindings/ < keybindings.dconf

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Linux Scaling

Force scaling of applications when in HiDPI screens.

Add to the command, X being the scale factor:

--force-device-scale-factor=X

Example, execute Spotify with 2x scaling:

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{
  "window.title": "${dirty} ${activeEditorMedium}${separator}${rootName}",
  "editor.formatOnPaste": true,
  "editor.fontFamily": "Operator Mono",
  "terminal.integrated.fontFamily": "Fira Code",
  "terminal.integrated.fontSize": 14,
  "terminal.integrated.lineHeight": 1.5,
  "editor.fontSize": 18,
  "editor.renderWhitespace": "boundary",
  "editor.autoIndent": true,

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:100000000C94C3030C94E0030C94E0030C94E00301
:100010000C94E0030C94E0030C94E0030C94E003D4
:100020000C94E0030C94E0030C942C2B0C94FE2B0A
:100030000C9492230C94E0030C94E0030C94E003E2
:100040000C94E0030C94E0030C94E0030C94E003A4
:100050000C94E0030C94FA230C94E0030C94E0035A
:100060000C94E0030C94E0030C94E0030C94E00384
:100070000C94E0030C94E0030C94E0030C94E00374
:100080000C94E0030C94E0030C94E0030C94E00364
:100090000C94E0030C94E0030C94E0030C94E00354

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const INVALID = -1;

const binarySearch = (target,  arr) => {
  const start = 0;
  const finish = arr.length - 1;
  const middle = Math.floor((start + finish) / 2);
  
  console.log(arr);
  console.log('middle value: ',arr[middle]);
  

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(async () => {
  const got = require("got");
  const publicIp = require("public-ip");

  // get public ip
  const publicIpV4 = await publicIp.v4();

  // get location from ip
  try {
    const response = await got(`http://ip-api.com/json/${publicIpV4}`);