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Set up VPS server for beginner

use Ubuntu 16.04/18.04 (lsb_release -a)

Get Started

• Update packages and system

  • sudo apt update
  • sudo apt upgrade

  If you do encounter problem like this, "A new version of configuration file/etc/default/grub is available,but the version installed currently has been locally modified".

> You can choose "install the package maintainer's version."

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Ubuntu useful commands

• list users

  compgen -u or cut -d ":" -f 1 /etc/passwd

• list groups > compgen -g

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@echo off

SET CMDER_ROOT=C:\PortableApps\cmder_mini

SET ConEmuDir=C:\PortableApps\cmder_mini\vendor\conemu-maximus5

SET CMDER_INIT_BAT=C:\PortableApps\cmder_mini\vendor\init.bat

C:\Windows\sysnative\cmd.exe /k "%CMDER_INIT_BAT%"

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extern crate rand;

use rand::prelude::*;

fn main() {
  const LEN: usize = 10;
  let mut arr: [i32; LEN] = [0; LEN];
  let mut rng = thread_rng();
  for index in 0..LEN {
    arr[index] = rng.gen_range(0, 101)

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use std::fmt;

// #[derive(Debug)]
struct Point<T> {
  x: T,
  y: T,
}

impl <T> fmt::Debug for Point<T> where T: fmt::Display {
  fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {

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use std::fs;
use std::io::{ Read, Write };
use std::net::{ TcpListener, TcpStream};

fn main() {
  let server: TcpListener = TcpListener::bind("127.0.0.1:8080").unwrap();
  for stream in server.incoming() {
    match stream {
      Ok(mut stream) => {
        router(stream)

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package hi

import (
	"crypto/md5"
	"encoding/base64"
	"encoding/json"
	"fmt"
	"io/ioutil"
	"net/http"
	"strconv"

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<template>
  <div class="photo-compared" :class="className" @mousedown="onPointDown" @touchstart="onPointDown">
    <div class="photo-compared__frame" :style="frameStyle"></div>
    <div class="photo-compared__before" :style="beforeStyle"></div>
    <div class="photo-compared__after" :style="afterStyle"></div>
    <div class="photo-compared__handler" :style="handlerStyle"></div>
  </div>
</template>

<script>

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module.exports = function () {
  //
  // [ express middleware ]
  // Generate a /fake/images route for testing images source
  //
  // images service origin:
  //  - PICSUM(https://picsum.photos)
  //      Created by David Marby & Nijiko Yonskai
  //      Having trouble? Poke @DMarby on Twitter
  //      Images from unsplash

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const fs = require('fs')
const path = require('path')
const ora = require('ora')
const chalk = require('chalk')
const mkdirp = require('mkdirp')
const globby = require('globby')
const archiver = require('archiver')
const clear = require('clear')
const pkg = require('./package.json')