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Script for concatenation

Here a tip for using split and cat, you can use this simple bash script for concatenating the pieces of the file, first you have to change the current directory to the one with the current files part.

You will be asked by the base name and the extension of the file. Easy!

#! /bin/bash
read -p "Base name: " basi
read -p "Extension: " ext
cat $(ls $basi*) > $basi.$ext

Site announcements.

I lost my domain rpm.li, but I got zsh.li instead. Did you know that the dot li domains has to be renew 15 days before the expiration date?

The blog was moved from pinkhat.rpm.li to pinkhat.zsh.li

Also cat.rpm.li was moved to cat.princesa.company and the public link shortener was removed.

The Screenshot in https://pinkhat.zsh.li gallery was removed and will be included again in a more traditional way.

The home page is now very minimalist and includes links for all sites.

I tried to include bitcoin based advertisement, but I didn't liked because it makes the load of the sites slower, Advertisement it's like politics and religion, polemic.

Lately I been working in increasing the efficiency of the site instead of creating content, but there will be new posts and content soon.

Using QR codes for coding files and text

The other day I discovery how change the Guard node (Entry node) in Tor for the Tor daemon, just delete all the files in /var/lib/tor/. This is a bad thing to do, for more information search in Duckduckgo.

Today we will learn how to use QR codes for encoding files. Sometimes we use virtual machines that have no means to interact with the host machine. Maybe due to security concerns or you don't want to mess with config files and command line options. Or simply because you are only allowed to send pictures but no files.

Whatever is your reason, you must be truly desperate to use it as this method is only limited to 3000 characters.

I also tried with OCR software, but that was a pretty bad idea, the QR codes works just well.

Let's we suppose that we want to encode a text file as QR pictures, these are the steps. You should use the base64 command for non plain text files (base64 binary > file.txt)

Step 1. Install zbar where you will decode the text.

You can find it in Ubuntu as zbar-tools and is available in AUR as zbar-headless. In AUR you will also found the QT and GTK version.

I actually compiled it manually and disabled some features at compile time as we only will need the cli.

./configure --without-gtk --without-qt --disable-video

Step 2. Install qrencode

Install this in the place where you will generate the QR pictures. This application is available in the Debian/Ubuntu and Arch repos.

Step 3. Split the file

This step is need only if you need to split the file in several parts as the limit is about 3000 characters With the following command you can split a file by number lines.

split file -l number

You can count the total lines with the following command

wc -l file

Step 4. Create the QR

Execute the following command in the same directory where you split the file:

for p in {a..z} ; do ( cat xa$p | qrencode -o qr$p.png ) ; done

Step 5. Decode the QR codes

Before continue you have to take pictures to the qr codes or taking screenshots, and then rename the pictures with their original names. Then cd to the directory containing the qr pictures.

for p in qr*.png ; do ( zbarimg --raw $p | sed '$ {/^$/d};' ) > ${p%.*}.txt; done

Step 6. Concatenate the files

cat qr*.txt > file

This method works if the qr images are being saved in the target machine with the same name as the source machine.

Installing Conky in Qubes OS 4.0

Qubes Os Screenshot

This is a bad thing to do, but the easiest way to install Conky in Qubes OS is using the RPM packages of Fedora 24.

First you need to download the following packages:

  • giflib-4.1.6-15.fc24.x86_64
  • imlib2-1.4.9-1.fc25.x86_64
  • iw-4.1-2.fc24.x86_64
  • crda-3.18_2016.02.08-1.fc24.x86_64
  • wireless-tools-29-14.1.fc24.x86_64
  • tolua++-1.0.93-18.fc24.x86_64
  • conky-1.10.4-1.fc25.x86_64

Then install all them, they are in the installed order, the packages highlighted with bold letters are the main dependencies for installing conky

You can install all of them using

rpm -i *

Qubes Os is not for everyone.

When I first tried Qubes OS some months ago, it changed my view of security. Many people complains that is not very good for daily work, but I don't think that's have to be true.

I mean, I've using Slackware for some months, the more hard is something, the most creative you became. I'm impressed of myself due to my ability to solve problems.

I don't really know why I chose Slackware, the more I tried to explain, the more false looks for me. But I'm sure that I chose it because the DVD includes lots of useful utilities and windows managers.

With regards with Qubes OS, if you get used to security, then Qubes OS will be a good fit for you. But I don't know what to say, my way of understanding the world is incomprehensible for everyone. In my mind things really complex are too simple for me. By the other hand, frequently complex activities or plans of mine are empty of meaning.

But I think that there are simple things I liked about it: The main filesystem in the Virtual Machines are keep intact and changes are lost in each reboot, I really like how it it's isolated because there doesn't remain the system logs.
You can easy deleted a virtual machine and so easily control the metadata of your activity.

Actually I'm a bit obsessed in controlling the information because everything generates metadata. It's an obsessive-compulsive idea, but maybe I'm not wrong because the experts in security says to treat the information the same as radioactive waste.

Also I do like protecting the information, maybe I just care about information as few people in the world. I also love sharing information.

Does really people has an appropriate computer?

I would say that you should have at least 100G free for Qubes OS, 8G of RAM and a fast SSD. I use a raid with 3 hard disk and the start up process takes some time. I only suspend the computer instead of shutting down it in order to avoid stressing so much my hard disks. Qubes OS is making to suffer my hard disk. You can do many optimizations in the hard disk increasing the cache and delaying the writes.

I highly recommend a PSU because the last time my Qubes Os were ruined with an power outage in my house. The disposables machines uses lots of IO resources. I may say that the Anaconda installer is kind of tricky. It contains little bugs, so you will have to get dirty in the terminal.

Does really people think the more complexity, the more prone to failure?

Actually my Qubes OS system is working with 70 partitions of many kinds, loop devices, device mapper, and traditional, half of them mine, the other half are dependencies for Qubes OS. By the way, I only use 4 workplaces.

So don't be silly and do not create so much workplaces. Sometimes people are afraid of creating a third partition when right here we have tens of partitions.

Does really people know how to use Tor?

I was thinking that we don't need two Whonix installations since we can improvise the Whonix gateway with the Fedora template using a transparent Tor proxy. It's only a matter to modify the tor browser typing about:config and specifying the IP of the router plus the open port 9050. Finally disabling the extension that Start Tor. It's important to do in this way and not enabling the transparent proxy in Tor Browser since the transparent proxy cannot change the IP in each tab.

Does people really realize that more Templates means more updates?

Keep it minimalistic, because installing Qubes OS is like installing 5 operative systems, so it will increase the complexity of maintaining.

Does people really know about Fedora and Debian?

This question is relevant because some people rarely uses Linux, or more important, you may use Linux but don't know about both RPM or Deb package system. The RPM package system is special and sometimes needs kind of maintenance in matters such as expired package cache, or maybe the updates systems is locked.

Another considerations:

Moving files to dom0 isn't the most easy, but you can get used to the command to do it.