hacking bitcoin exchange

Tutorial on how to create a paper and digital offline Bitcoin wallet with Linux

Objective

The objective is to create an offline digital and paper bitcoin wallet using Linux operating system, VirtualBox and Electrum Bitcoin wallet. The outcome of this tutorial will be a paper with written keywords which can be used to access your bitcoins. We will also create an encrypted version of virtual machine as a digital backup to be stored digitally on a secure medium which will provide a convenient access to your bitcoins if necessary.

Operating System and Software Versions

  • Operating System: – Debian 9 GNU/Linux
  • Software: – Electrum 3.0.3 or higher, VirtualBox Version 5.2.2 r119230

Requirements

Privileged access to your host operating system will be required to install Virtual Box virtualization software.

Difficulty

MEDIUM

Conventions

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How to obtain Sunrise & Sunset time for any location from Linux command line

Objective

The objective is to use command line and bash shell script to obtain Sunrise & Sunset time information for any given location.

Operating System and Software Versions

  • Operating System: – Linux distribution agnostic.

Requirements

Installed lynx tool and access to shell command line. Your location code obtained from https://weather.codes/search/.

Difficulty

EASY

Conventions

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How to install missing ifconfig command on CentOS Linux

Objective

The ifconfig command has been deprecated and thus missing by default on CentOS Linux.

# ifconfig
bash: /usr/sbin/ifconfig: No such file or directory

The new and recommended alternative for examining a network configuration on CentOS Linux is ip command. For example to use ip command to display a network configuration run the following:

# ip address

The above ip command can be abbreviated to:

# ip a

If you still prefer to use ifconfig command you can easily install it as part of the net-tools package.

Requirements

Privileged access to your CentOS Linux system is required.

Difficulty

EASY

Conventions

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Children multiplication tables practice test with Bash script on Linux

Introduction

The following post is a little bit different from my other posts as it does not solve any of your Linux configuration problems. Apologies there! This post is an attempt to kill multiple birds with one stone, hence expose children to a command line, avoid web flash and ads driven multiplication practice tests online and most importantly gain some multiplication skills along the way.

My daughter reached the age where she is required to perform multiplication calculation at school. So together we have developed a below Bash script to take her 1×1 to 10×10 multiplication tables practice to the next level. She approved all the output colours with a “cool” mark, and to my surprise, she was very quickly able to correct my forgotten closing quotation marks during the development thus significantly improving development efficiency:-)

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