sexta-feira, abril 26, 2019

ssh-agent load only once with ssh-ident, ssh-add, ssh-keygen, eval `ssh-agent`

    All you need to run ssh-ident is a standard installation of python >= 2.6,
    python > 3 is supported.
    If your system has wget and are impatient to use it, you can install
    ssh-ident with two simple commands:
       mkdir -p ~/bin; wget -O ~/bin/ssh; chmod 0755 ~/bin/ssh
       echo 'export PATH=~/bin:$PATH' >> ~/.bashrc
    Logout, login, and done. SSH should now invoke ssh-ident instead of the
    standard ssh.
Problem with ssh-agent. That can be solved with ssh-ident above!

Configuring all of this on your machine

So, let's summarize the steps:
  1. Generate a set of keys, with ssh-keygen.
  2. Install your keys on remote servers, with ssh-copy-id.
  3. Start an ssh-agent to use on your machine, with eval ssh-agent.
  4. ssh-add your key, type your password once.
  5. Profit! You can now ssh to any host that has your public key without having to enter a password, and use ssh -A to forward your agent.
Easy, isn't it? Where people generally have problems is on how and where to start the ssh-agent, and when and how to start ssh-add.
The long running advice has been to start ssh-agent from your .bashrc, and run ssh-add similarly.
In today's world, most distributions (including Debian and derivatives), just start an ssh-agent when you first login. So, you really don't have anything to do, except run ssh-add when you need your keys loaded, and be done with it.
Still many people have snippets to the extent of:
if [ -z "$SSH_AUTH_SOCK" ] ; then
    eval `ssh-agent`
in their .bashrc, which basically says "is there an ssh-agent already running? no? start one, and add my keys".
This is still very annoying: for each console or each session you login into, you end up with a new ssh-agent. Worse: this agent will run foreverwith your private keys loaded! Even long after you logged out. Nothing and nobody will ever kill your agent.
So, your three lines of .bashrc snippet soon becomes 10 lines (to cache agents on disk), then it breaks the first time you use NFS or any other technology to share your home directory, and then... more lines to load only some keys, some magic in .bash_logout to kill your agent, and your 4 lines of simple .bashrc get out of control

sábado, abril 20, 2019

complete How to Remove Viruses malware From Your Computer

Download :
Manual :


Tron is a script that "fights for the User." Think of it as a tech-on-a-thumb-drive that aims to automate ~85% of the tedious work in cleaning a Windows system, with the understanding that some things are better left to the discretion of the tech. It is built with heavy reliance on community input and updated regularly.
Bug reports, suggestions etc are welcome. If you have issues with this release, post a top-level comment and myself or one of the mods will answer, typically in < 24 hours.

domingo, abril 14, 2019

Raspberry Pi With 4 Relay Module ( for Home Automation )

Picture of How It Works

Cheap, Effective and Modern Home Automation
Firstly we will connect the raspberry and the 4 array module and test it locally. The next step is to make a web app that will control our module . We will make it with apache server , php , javascript , jquery , bootstrap , bootstrap- switch buttons and some python . Everything is explained with a comments when you open the file , you also can see the documentation in github. The files are uploaded here and can be also find in github .

Step 1: What You Need
 Picture of What You Need
We need :

Raspberry Pi
4 Array Relay Module
6 Wires
Wifi Dongle
Filezilla (optional)
SHH (optional)

Step 2: Wiring Picture of Wiring
 Picture of Wiring
 Picture of Wiring
We need to connect our Raspberry and the module .We will get the 5V from the Raspberry (not very recommended but its easy ) .So lets begin :

PI GPIO | Relay module

Pin 4 ---------VCC

Pin 6 ---------GND

Pin 8 ----------IN4

Pin 10 ---------IN3

Pin 11 ---------IN2

Pin 12 ---------IN1

Step 3: Testing
 Picture of Testing
 Picture of Testing
Now we need to start the raspberry and to connect to the power supply and connect to it over FTP with Filezilla or start it on monitor . Next download and put the file in the main dir (home/pi).Then start the python script by typing :

sudo python
If leds start flashing from IN1 to IN4 and shutdown from IN4 to IN1 then everything is okey and the wiring is like currect .We can move to the next step .


The relay boards are powered by 5v and the relays are triggered by taking the input pin to ground. Since the Raspberry Pi's GPIO pins output 3.3v I used a set of transistors to take the relay pins to ground.

So when you are setting the GPIO output value:

1) 0 the relay starts ;

2) 1 the relay stops .

Add TipAsk QuestionCommentDownload
Step 4: Installing Apache and Php
We will need them for the server part .Helpfull link.

To install apache2 we need to run :

sudo apt-get install apache2 -y
To test the webserver we can you on the raspberry browser

(raspberry ip address) .Type
to get the current IP .
Next install PHP5 module for APACHE :

sudo apt-get install php5 libapache2-mod-php5 -y
And remove index.html file :

sudo rm index.html
The next thing is to navigate to the default directory:

For Raspbian Wheezy is /var/www ,
For Rspbian Jessie is /var/www/html
So we type :

cd /var/www/html
ls -al
And this will output :

total 12
drwxr-xr-x  2 root root 4096 Jan  8 01:29 .
drwxr-xr-x 12 root root 4096 Jan  8 01:28 ..
-rw-r--r--  1 root root  177 Jan  8 01:29 index.html
We need to change the permission if we want to upload or modify files :

sudo chown pi: index.html
Delete the index.html file from the dir.

Step 5: Uploading the Needed Files for Your Web App
 Picture of Uploading the Needed Files for Your Web App
You need to download the .rar file , extract it and copy the files with Filezilla to the main dir of Raspberry home/pi and to the var/www. For pasting the files into var/www you need to set a permision .

at var/www
at home/pi
When you are done coping the files , just go to your browser , type RaspberryIP/index.html (ex: and the webpage will be opened .And also you can test it and remotely control the relays from any device that is connected to your local network(router) .

Enable sudo for APACHE
vi /etc/sudoers.d/010_apache2-nopasswd
User_Alias      APACHE = www-data
Cmnd_Alias      FIREWALL = /usr/bin/python


Attachments Download

Step 6: How It Works Picture of How It Works

I will explain it shortly. If you want to get to more details you can see the project in github.

When we click on the button , the ajax request has been called and the php file from it is called . From the php we execute a python script file with some params . The python script return us json converted array , which we pass to the php and the php passes it to html file .We can go only in the one way but if we want to reload the page we need in what position the relays are . The other point is if we dont do it that way there is no feedback and we cant see what is happening .

Bypassing USB Power Port on My Raspberry Pi Model B+ || power on raspberry 3 solder pp1 without micro usb

With a Raspberry Pi 3. On this unit I used PP2 (Positive) and PP3 (negative), which according to the schematic here shows it as being located before the reverse protection diode. You can also use PP5 for negative but I found that a bit too close to PP1. Of course, it's best to cover the whole thing with hot-melt glue to minimize strain on the wires.