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Required programs: curl, nslookup, grpcurl, traceroute, ping, mtr

Note: On some Linux distributions, you need to manually install iputils-ping, instead of inetutils-ping.

sudo apt-get install -y iputils-ping

(1). What is the public IPv4 address? Does it have a DNS PTR record?

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1. Environmental information

• OS: Ubuntu 20.04.2 LTS (GNU/Linux 5.8.0-59-generic x86_64)
• Network: 192.168.xxx.0/24
• Ubuntu multipass host machine IP: 192.168.xxx.yyy(static IP)
• NIC: enp2s0(bridge host NIC)
• Bridge NIC:br0

2. Prerequisites

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[{'city': 'Abidjan, CI', 'name': 'abj01'},
 {'city': 'Albuquerque, NM, US', 'name': 'abq01'},
 {'city': 'Accra, GH', 'name': 'acc01'},
 {'city': 'Adelaide, AU', 'name': 'adl01'},
 {'city': 'Auckland, NZ', 'name': 'akl01'},
 {'city': 'Almaty, KZ', 'name': 'ala01'},
 {'city': 'Algiers, DZ', 'name': 'alg01'},
 {'city': 'Algiers, DZ', 'name': 'alg02'},
 {'city': 'Ahmedabad, IN', 'name': 'amd01'},
 {'city': 'Ahmedabad, IN', 'name': 'amd02'},

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#!/usr/bin/env bash
SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
cat $SCRIPT_DIR/test.sh

set -x
mkdir /artifacts

curl -4 ipconfig.io
traceroute -enm 18 -w 1 us-east.linode.jinwei.me
traceroute -em 18 -w 1 us-east.linode.jinwei.me

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tmux cheatsheet

As configured in my dotfiles.

start new:

tmux

start new with session name:

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from twython import Twython, TwythonError
import time
import sys

APP_KEY = ''
APP_SECRET = ''
OAUTH_TOKEN = ''
OAUTH_TOKEN_SECRET = ''

twitter = Twython(APP_KEY, APP_SECRET, OAUTH_TOKEN, OAUTH_TOKEN_SECRET)

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gsettings set org.gnome.desktop.interface enable-animations false

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04b65ff15ce2b3302f960dd3f29e41e7618aebc0553051bd88e0df9c81b65c9517b5019acc3cc395e4bae94175f41d4d2e54076ee19337dc05c2653d5ccec23ffa;jjyr

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#include <iostream>
#include <chrono>

class TicToc
{
private:
	typedef std::chrono::high_resolution_clock clock;
	typedef std::chrono::microseconds res;
	clock::time_point t1, t2;