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Notes

Ref: Coursera course on Linux for developers

Week 1:

• Kernel vs OS and Tools
  • Linux is just the kernel ....
• Normally users will always be running a GUI
• Almost all desktop linux system will be built using a X window system(X) as the base of this interface

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Running your own encrypted chat service with Matrix and Riot

Workshop Instructor:

• Lilly Ryan @attacus_au

This workshop is distributed under a CC BY-SA 4.0 license.

What are we doing here?

The goal of this workshop is to teach you how to configure and run your own Matrix/Riot service. By the end of the workshop, you should be able to log into secure chat rooms and invite others to the same server.

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Setting up Pi-Hole on Cloud/VM.

Objective :

• Set up a effiecient Ad Blocker, which can be scaled to as many devices

Required :

• Any virtual machine and Internet Connection

Steps :

• Set up a VM on any cloud provider(This guide is based on my set up on Google Cloud)

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############################################
# To Completely Block Facebook
# Add these entries below to your hosts file
#
# Your hosts file Location:
# Linux, Unix and Mac OS X  -> /etc/hosts
# Windows XP, Vista and Windows 7 ->  C:\WINDOWS\system32\drivers\etc\hosts
# Windows 2000  -> C:\WINNT\system32\drivers\etc\hosts
# Windows 98/ME ->  C:\WINDOWS\hosts 
# 

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Steps.

• Generate RSA key pair for ssh in local computer use ssh-keygen.

• Copy the file contents of ~/.ssh/id_rsa.pub

• Go to settings in github.com

• add new SSH key

• paste the RSA public key here. (remove extra new line at the end, if any)

• This is overall work done,

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# ~/.bashrc: executed by bash(1) for non-login shells.
# see /usr/share/doc/bash/examples/startup-files (in the package bash-doc)


# Set Proxy
alias sp12='export http_proxy="172.16.1.12:3128";
            export https_proxy="172.16.1.12:3128";
            export ftp_proxy="172.16.1.12:3128";
            export HTTP_proxy="172.16.1.12:3128"
            export HTTPS_proxy="172.16.1.12:3128";

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Testing _subscript and ^superscript

Testing _{subscript subscript level 2}

Testing ^{superscript superscript level 2}

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import numpy as np 
from numpy import *
import math

# here input will be sum(xi*wi)
def sigmo(x):
	return 1/(1+exp(-x))

#here also input will be sum(xi*wi)
def sigmo_derivative(x):

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import numpy as np 
from numpy import *


# here input will be sum(xi*wi)
def sigmo(x):
	return 1/(1+np.exp(-x))

def sigmo_derivative(x):