MbuguaCaleb

SSH(Entails to when a client is communicating to a server)

SECURE SHELL

PROROCOL TO COMMUNINCATE WITH OTHER COMPUTERS AND SIMILAR TO (https,http,ftp)
Used to do just about anything in a remote computer and mostly used via the terminal/commandLine
Traffic is Enccrypted

Can also be used via GUI eg in WINSCP
Can also be used in ftp..file zilla

MbuguaCaleb

# Viewing your Posgtres Clusters

sudo pg_lsclusters 

# create a second postgres cluster 
sudo pg_createcluster 10 replica1 

#checking the status of the cluster
sudo pg_ctlcluster 10 replica1 status 
sudo systemctl status postgresql@10-main 

MbuguaCaleb

<div id="wrapper">
      <div id="left">
        <div id="signin">
          <div class="logo">
            <img src="https://image.ibb.co/hW1YHq/login-logo.png" alt="Sluralpright" />
          </div>
          <form>
            <div>
              <label>Email or username</label>
              <input type="text" class="text-input" />

MbuguaCaleb

Private and Public Keys
Gaining access to a remote server

1)It is SSH-Secure Shell Protocol to communicate with other computers .It is similar to Protocals like https,hhtp and ftp)

2)Do just anything in the remote Computer (Make files,,,etc)

3)Traffic is Encrypted while using ssh..Used Mostly in Terminal/Commandline..Can also be used in GUI EG SCP...ALSO WITH FTP CLIENTS
Like filezilla

MbuguaCaleb

void main() {

  //Instantiating a class
  User userOne=User('caleb', 24);
  
  //calling an attribute/property of the class
  print(userOne.username);
  print(userOne.age);
  
  User userTwo = User('mercy',23);

MbuguaCaleb

void main() {
 
  /*Map is a set of key value pairs similar to
   * object literals in javascript and dictionaries in 
   * python
   * 
   */
  Map student ={
   'name':"Mbugua Caleb","age":"24"
  };

MbuguaCaleb

(a)Internet is a global network of computers.

(b)Each Commputer/Router has an IP address (which is unique to it)Remeber the concept of public and private IP address..(in a local
network computers in the same network each have a unique private IP address)

(c)Computers talk to each other using the TCP/IP protocal.

(d)HTTP handles web traffic (request/response)

(e)DNS is used to Map IP addresses to domain names.

MbuguaCaleb

-- What is the result?
SELECT MAX(id) FROM your_table;

-- Then run...
-- This should be higher than the last result.
SELECT nextval('your_table_id_seq');

-- If it's not higher... run this set the sequence last to your highest id. 
-- (wise to run a quick pg_dump first...)

MbuguaCaleb

#Strings and String Methods.

using System;

namespace csharp_one
{
    class Program
    {
        static void Main(string[] args)
        {

MbuguaCaleb

//Strings
package com.caleb;

public class Main {
    public static void main(String[] args) {
       String hello ="   CALEB" + "MBUGUA!!  ";
       //Concat strings
        //String is a class therefore it has methods we canbe able to access.
        System.out.println(hello.toLowerCase());