Are you seeing a charging screen with an advertisement while your Android device is charging? It could be possible that your device is installed with a malicious app (Ahh! sometimes even genuine apps) that might be pushing ads. When you download and install an application from Google Play or from a third party…

Question: I have been using TubePress (WordPress plugin) version 3.1.8 for many years now. But suddenly, the plugin broke with an error message as YouTube responded to TubePress with an HTTP 410. Unfortunately, the plugin page in WordPress has the same version of TubePress and it’s no longer been supported. How…

I generally use telnet command to test whether a given port is listening on a remote machine. For e.g., telnet remote_host 80. But once I was in a situation to test a port on a remote machine via HTTP proxy. I did use a CONNECT method to achieve that. Here’s…

If your Linux machine is behind a proxy server, then you can install Proxychains package to access internet via the given proxy address. Proxychains is an opensource software that forces any TCP connection by a given application through proxy such as TOR (by default), SOCKS4, SOCKS5 and HTTP. Well, here we…

If you are a student or a researcher working in Cloud computing domain, then you must have heard about CloudSim framework. It’s a framework for modeling and simulation of cloud computing infrastructures and services. CloudSim supports modeling and simulation of cloud computing data centers, virtualized hosts, allocation policies, network topologies…

One of my students asked me a couple of questions – what is the difference between print and echo (which I have covered already here) and the difference between die() and exit() functions. Well, there’s a slight difference between die() and exit(). Most importantly, die and exit are not functions and…

Here’s a latest vulnerability called DROWN (Decrypting RSA with Obsolete and Weakened eNcryption) that aims to attack servers using weak SSL version 2.0 (SSLv2) protocol for HTTPs, SMTP, IMAP, POP etc…Basically any service that uses SSL/TLS is subject to be vulnerable over SSLv2 . DROWN allows an attacker to decrypt communication…

Question: By mistake I had disabled ‘root’ account in a CentOS Virtual machine running in VMWare. Thereafter, I tried all possible ways to recover ‘root’ account and finally decided to reboot the VM in a single user mode. Unfortunately, the VM failed to boot in single user mode and the error…

This tutorial will guide you to install a simple command-line utility called youtube-dl that allows you to extract audio from your favorite YouTube videos. The utility can be installed easily on any Linux platform that supports Python Interpreter (version 2.6, 2.7 or 3.2+). If you don’t have Python installed, then here’s…

Question: I was using youtube-dl command-line utility on CentOS to extract an audio from YouTube Video. However, the command failed with an error message as ERROR: WARNING: unable to obtain file audio codec with ffprobe. Here’s the complete error message: $ ./youtube-dl -x –audio-format mp3 https://www.youtube.com/watch?v=EhhiY11Z9-U [youtube] EhhiY11Z9-U: Downloading webpage [youtube]…

I got an ERROR: ffprobe or avprobe not found while installing youtube-dl command-line utility on CentOS. This tutorial will show you on how to compile and install FFmpeg from source with few library support. The ffprobe command comes with FFmpeg package. Download FFmpeg: $ git clone git://source.ffmpeg.org/ffmpeg.git ffmpeg Cloning into ‘ffmpeg’… remote: Counting objects:…

Question: I was installing ffmpeg with Yasm support, during which I need to use autoconf to generate configuration script on CentOS 6.6. Unfortunately, autoconf command failed with an error message Autoconf version 2.60 or higher is required. Below is the complete error message: $ autoreconf -fiv autoreconf: Entering directory `.’ autoreconf:…

I had setup a private MediaWiki for one of my project and that allows only logged-in users to view its content or page. But my colleague came up with an issue, where the images and documents that are uploaded via MediaWiki was still accessible directly without logging-in. For example, assume…

Question: Thanks to the guide on How to compile and install Python with OpenSSL Support. However, the installation failed with an error message error while loading shared libraries: libssl.so.1.0.0 cannot open shared object file during make. According to the installation guide, I installed OpenSSL and then edited Setup.dist file to refer the OpenSSL…

Question: I got this error urllib2.URLError: <urlopen error unknown url type: https> while installing packstack. After checking the program, I understood that the script is importing urllib library and uses urlretrieve function to fetch a file from https URL and it seems like the function is not able to fetch data from https URL. So I decided…

Question: I have used SPOOL command in Oracle SQL for storing query results into a file and when all is done, spool can be turned off. How can I achieve the same in MySQL? For example, In MySQL the ‘SHOW FULL PROCESSLIST’ query will list all MySQL processes that are currently running on…

Today, I’m going to tell you how to install Python 2.7 and 3.5 versions on CentOS 6.4. And we are going to do this without breaking the existing Python installation (the default system installed version is 2.6.6 on CentOS 6.4) and other system tools such as yum. Well, the main…

Question: I was stuck with an error ImportError: No module named ConfigParser when I run packstack command in CentOS. Below is the complete error message: $packstack –gen-answer-file=answers.txt Traceback (most recent call last): File “/usr/local/bin/packstack”, line 4, in <module> __import__(‘pkg_resources’).run_script(‘packstack==7.0.0’, ‘packstack’) import ConfigParser ImportError: No module named ‘ConfigParser’ Can you tell me how to…

Error: The packstack command failed with an error message as “ImportError: No module named ConfigParser”. So I tried installing ConfigParser using Python PIP, but the installation failed as shown below. $pip install ConfigParser Collecting ConfigParser Downloading configparser-3.3.0r2.tar.gz Complete output from command python setup.py egg_info: from configparser import ConfigParser File “/tmp/pip-build-vks_efrb/ConfigParser/configparser.py”,…