Multichain Blockchain Platform: Brief Introduction & Installation

This video gives a minimal few minutes introduction to the Multichain blockchain platform followed by quick installation on an Ubuntu 20.04 OS terminal. This is one of the easiest platforms to play with and understand in much better way the mechanics of blockchain. Primarily CLI based, this video installs the multichain with few commands.

 

Installing GO in Ubuntu 18.04 LTS

M sharing here only the terminal commands for installing GO in Ubuntu 18.04...followed by checking whether it is working or not....

Commands as follows in yellow :

go to https://golang.org/dl/

Download the recent tar...herein it is go1.14.linux-amd64.tar.gz

Further to this untar the same...and move the files to /usr/bin

sudo tar -xvf go1.14.linux-amd64.tar.gz

sudo mv go /usr/local

cd /usr/local/

sudo chown -R root:root ./go

Using gedit or any other vi/vim editor, open the ~/.profile file and append the following lines at the bottom :

export GOPATH=$HOME/go
export PATH=$PATH:/usr/local/go/bin:$GOPATH/bin

Save and load the commands vide the following command

source ~/.profile

Now create a new directory

mkdir GOLA

Within this create /src/welcome and within that directory copy and paste the contents of the file below

mkdir -p GOLA/src/welcome && cd GOLA/src/welcome

touch welcome.go

gedit welcome.go 

add the following lines here in this file

package main
import "fmt"
func main() {
    fmt.Printf("welcome to go world\n")
} 

and save above followed by build and running the file

go build

./welcome

message should be displayed welcome to the go world

SPLIT LARGE FILES INTO SMALLER PARTS & MERGE : FOR EASY MIGRATION in LINUX SYSTEMS

1.    Routine troubleshooting in system handling gives us a way to explore and try new options.Recently tried a new way to migrate large files(around ~17 GB in my case here ). Although there are easier options available by simply copying in a external device,but in my case external devices were not allowed so attempted to split the large file into 3 GB size files and then finally could merge them....and could also verify the hash....and it was absolutely right...sharing few screen shots :

2.    The entire thing of splitting and merging gets over in simple two commands of SPLIT & CAT

 > split -b file.name
 > cat x* > file.name

3.   I have a .vdi virtual image file which is approx 16 GB in size.The file details are seen in the screen shot below :

Here ..before I go for the split...I have taken the hash of the same to compare it later after i merge the split parts...to check the originality of files and I get the hash of the file as bb867749cf4c0325abe145a0998e3b04

 

In the screen shot below I use the split command,which is inbuilt to UBUNTU and typically all Linux systems....I split the file in 3GB parts...

 

This screen shot shows the watch screen shot of the populating split parts...

 This screen shot shows the watch screen shot of the populating split parts...

 and here i get the final .vdi file as well m able to match the hash as same ie bb867749cf4c0325abe145a0998e3b04

Kali Linux 2 : Installing and Setting up OPENVAS

1.     This post will be useful for users who have just installed Kali Linux 2 and wish to install and setup OPENVAS.OpenVAS is a framework of several services and tools offering a comprehensive and powerful vulnerability scanning and vulnerability management solution. The framework is part of GreenBone Networks commercial vulnerability management solution from which developments are contributed to the Open Source community since 2009. 

 2.   The following set of commands vide a Kali terminal will be in the following sequence :

:~ apt-get update

:~ apt-get -y upgrade

:~ apt-get install openvas

:~ openvas-check-setup

after you run the open-check-setup command ,there is a possibility of something going wrong during installation...if there are some errors ...do the following at the terminal

:~ openvasmd --rebuild

next you might be prompted to create a user

:~ openvasmd --create-user= --role=Admin && openvasmd --user= --new-password=yourpassword

:~ greenbone-certdata-sync

Run the check setup again :

:~ openvas-check-setup

 the check setup screen should look like below :

 Final step to the access will need to browse you at the link as below to access Greenbone web interface

https://localhost:9392

 Thats all...start exploring the interface

Ubuntu: How To Create an ISO Image from a CD or DVD?

1.   For Ubuntu users this small post gives u a single line command on how to create a ISO image from a physical CD/DVD.

2.    First step is to simply load the CD/DVD.

3.    Second step involves opening the terminal by pressing CTRL+ALT+T

4.    Check where is the CD/DVD mounted by typing "lsblk" without quotes as seen below in a sample shot.

 

5.    Type Execute the following command: cat /dev/sr0 > /home/endhiran/Desktop/kali.iso where /dev/sr0 is the device name for your drive.

                

The disc will begin to spin and the ISO image will start being constructed. Once it has completed, you have an ISO image of your CD. To verify that the image was properly created, mount the ISO file and check the contents.

[SOLVED] : result code ns error failure virtualbox

1. If you ever get this message "result code ns error failure virtualbox" while you use virtual box...don't you worry...simple steps will resolve as follows:.

The screens you see are shown below first just to ensure that your and mine problem is same :

2.    So first thing is your remove Virtual box from the Ubuntu Software Centre or you can remove the same manually from terminally as root with the following commands :

sudo apt-get remove virtualbox-\*

sudo apt-get purge virtualbox-\*

init 6

sudo sh -c "echo 'deb http://download.virtualbox.org/virtualbox/debian '$(lsb_release -cs)' contrib non-free' > /etc/apt/sources.list.d/virtualbox.list" && wget -q http://download.virtualbox.org/virtualbox/debian/oracle_vbox.asc -O- | sudo apt-key add - && sudo apt-get update && sudo apt-get install virtualbox-4.3 dkms

3.     These 4 commands from the terminal should get you through!!! all d best

Installing Dongle on Ubuntu : Mobile Internet@USB MODEM

1.   Writing after a long time... I post here few lines that I recently learnt on installing and accessing internet vide Dongle with SIM on Ubuntu LTS 12.04.So in my case I have a Micromax dongle with a mobile Sim.

2.  Simply said the steps are mentioned below :

- Insert the USB dongle in any of the USB drives on your PC/Laptop.

- Goto Terminal and login as Root

- At the terminal get the details of the usb detected interfaces by typing lsusb

- So in my case the dongle detected is shown at the end ie OMEGA TECHNOLOGY

- Now we need to run a terminal command to mount the device and get it running as shown in the screen shot below

sudo modprobe usbserial vendor=0x1c9e product=0x9605

- Once the command is executed at the terminal,wait for few minutes and you see the additional ENABLE MOBILE BROADBAND as seen in the screen shot below....

 

 

3.   and with this you should be on with the internet....

Fedora 19 USB automount doesn't work : SOLVED

Having installed Fedora 19 Schrodinger's Cat recently, a problem came up that the USB that used to get auto detected in earlier versions stopped working......and could not be seen anywhere in the file manager...and the disk showed the following screen which has no USB disk.

(CLICK ON THE IMAGE TO ENLARGE)

But the good thing is that on doing LSUSB at the terminal it was being shown as follows :

Bus 001 Device 002: ID 4033:0042 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 002: ID 4051:0030 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 3d4b:0008 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1f6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 003: ID 0f6d:081b Logitech, Inc. Webcam C310
Bus 001 Device 004: ID 0c61:4d0f Primax Electronics, Ltd HP Optical Mouse
Bus 002 Device 005: ID 03f0:5201 Sandisk 

so mounted it the terminal way..

make a directory in home by the name of usb

mkdir usb

and

at the terminal type lsblk that will give you where to mount.In my case it is sdc1. My output comes as follows :

NAME            MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sda               8:0    0 931.5G  0 disk 
├─sda1            8:1    0 488.3G  0 part 
└─sda2            8:2    0 443.2G  0 part 
sdb               8:16   0 465.8G  0 disk 
├─sdb1            8:17   0   100M  0 part 
├─sdb2            8:18   0   500M  0 part /boot
└─sdb3            8:19   0 465.2G  0 part 
  ├─fedora-swap 253:0    0   5.8G  0 lvm  [SWAP]
  ├─fedora-root 253:1    0    50G  0 lvm  /
  └─fedora-home 253:2    0 409.4G  0 lvm  /home
sdc               8:32   1    30G  0 disk 
└─sdc1            8:33   1    30G  0 part /home/kalama/usb
sr0              11:0    1  1024M  0 rom 

now at the terminal simply type

mount -t vfat /dev/sdc1 /home/kalama/usb/


thats it ..now it will start showing when you do df -h as shown below :

[root@localhost ~]# df -h
Filesystem               Size  Used Avail Use% Mounted on
/dev/mapper/fedora-root   50G  4.8G   42G  11% /
devtmpfs                 2.9G     0  2.9G   0% /dev
tmpfs                    2.9G  664K  2.9G   1% /dev/shm
tmpfs                    2.9G  968K  2.9G   1% /run
tmpfs                    2.9G     0  2.9G   0% /sys/fs/cgroup
tmpfs                    2.9G   36K  2.9G   1% /tmp
/dev/sdb2                477M  117M  331M  27% /boot
/dev/mapper/fedora-home  403G  173M  383G   1% /home
/dev/sdc1                 30G   16G   15G  53% /home/kalama/usb

UPDATING FEDORA 18

From terminal,updating Fedora 18 goes like this :

thats


                 su -
Password: ******
                 yum update

TRUE CRYPT IN FEDORA 17: INSTALLATION

1.   The earlier version of Fedora had some token issues to deal with while installing True Crypt but not with this Fedora 17 Beefy Miracle.

2.   Few commands to be run from root after downloading the requisite version from the True Crypt site go as follows :

tar xvf truecrypt-7.1a-linux-x86.tar.gz 

yum install nss-pkcs11-devel fuse-devel wxGTK wxGTK-devel

yum load-transaction /tmp/yum_save_tx.2012-12-13.14-20.laXbNn.yumtx

yum install gnome-keyring-devel gcc-c++

export PKCS11_INC=/usr/include/gp11

./truecrypt-7.1a-setup-x86 

3.   Well if there are some token issues like shown below : 

../Common/SecurityToken.cpp:660: error: ‘CKR_NEW_PIN_MODE’ was not declared in this scope

../Common/SecurityToken.cpp:661: error: ‘CKR_NEXT_OTP’ was not declared in this scope

then you need to Open Common/SecurityToken.cpp in any editor and Scroll to line 660 and simply Comment out line 660 and 661. It should look like this after you edit:

//TC_TOKEN_ERR (CKR_NEW_PIN_MODE)

//TC_TOKEN_ERR (CKR_NEXT_OTP)

How to find if Python is installed in Linux ?

I was recently playing with Matriux Krypton tool chaosmap....but was unable to use this tool for some error that kept popping up...so I though if at all the PYTHON is installed or not?......the way to check this is to go to the terminal and write :

python -V

and u should see like  : Python 2.6.6

                                         (click on the image to enlarge)

Upgrading Backtrack R2 to R3 : Distribution Upgrade

Single line terminal command from the BT Terminal to upgrade your Backtrack Dist is

apt-get update && apt-get dist-upgrade

Print to PDF in Ubuntu 12.04 LTS

1.     This is a simple single line of command that u write at the terminal to install a third party app that will install a pdf printer in ur Ubuntu System.

sudo apt-get install cups-pdf

2.     This will be generally handy when u need to print your documents that are ready to print but u don't have a printer installed....actually create a virtual PDF printer on your ubuntu PC that lets you convert all your documents/images/anything into PDFs that you can subsequently send to print as and when u have the facility to print.

3.    Thanks http://ubuntuportal.com