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How to solve the curl port 443: Network is unreachable problem:

joridos@localhost:~/Documents/github$ opam init
default    Downloading https://opam.ocaml.org/urls.txt
'opam init' failed.
# opam-version    1.1.1
# os              linux
Cannot download https://opam.ocaml.org/urls.txt, please check your connection settings.
joridos@localhost:~/Documents/github$ curl https://opam.ocaml.org/urls.txt

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Windows Registry Editor Version 5.00
; Default color scheme
; for Windows command prompt.

; Values stored as 00-BB-GG-RR
[HKEY_CURRENT_USER\Console]
; BLACK DGRAY
"ColorTable00"=dword:00000000
"ColorTable08"=dword:00808080
; BLUE LBLUE

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Create your own Ethereum private network

Introduction

Used nodes:

Linux raspberrypi 4.9.41-v7+ #1023 SMP Tue Aug 8 16:00:15 BST 2017 armv7l GNU/Linux

Linux localhost.localdomain 4.14.5-200.fc26.x86_64 #1 SMP Mon Dec 11 16:29:08 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

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package main

import (
	"github.com/syndtr/goleveldb/leveldb"
	"fmt"
	"encoding/binary"
	"github.com/ethereum/go-ethereum/core/types"
	"bytes"
	"github.com/ethereum/go-ethereum/rlp"
)

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Docker - How to cleanup (unused) resources

Once in a while, you may need to cleanup resources (containers, volumes, images, networks) ...

delete volumes

// see: https://github.com/chadoe/docker-cleanup-volumes

$ docker volume rm $(docker volume ls -qf dangling=true)

$ docker volume ls -qf dangling=true | xargs -r docker volume rm

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Introduction

An introduction to curl using GitHub's API.

The Basics

Makes a basic GET request to the specifed URI

curl https://api.github.com/users/caspyin

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NOTE

You may not need local branches for all pull requests in a repo.

To fetch only the branch that you need, use Fetch and delete refs to GitHub pull request branches

If you do for some reason need all pull request branches locally, continue on.

---

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Table Of Content

Skip to the relevant sections if needed.

• 2-min tutorial to do it the quick-and-dirty-way
• Concepts for resolving Git conflicts
• Setting up different editors / tool for using git mergetool
  • Finding out what mergetool editors are supported
• mergetool simple code example for vimdiff
  • Resolving conflict from a Git pull
• Other great references and tutorials

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How To TCP NAT Traversal using Node.js and a STUN Server

With the scarecity of IPv4 addresses, and IPv6 still not available at large, NAT traversal is becoming a necessity. Especially with the generalisation of Carrier-grade NATs that you can find on mobile connections. Even with IPv6 you may suffer NAT66. Imagine your mobile device that gets only a single Ipv6 address, and you want to share it on your computer.

The solution might be in a decentralized protocol for address attribution such

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#!/usr/bin/env ruby
require 'open-uri'
require 'JSON'
require 'digest/sha2'
require 'pry'
require 'bigdecimal'
require 'bitcoin' # Because I need to cheat every now and then

# Usage:
# gem install pry json ffi ruby-bitcoin