[Linux]: Diagnose Network Issues using MTR – better than traceroute!
Monitoring network connectivity is an important part of server administration. Few tools like ping, traceroute are simple to use and provides valuable...
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How to Store the output of SHOW PROCESSLIST into a file in MySQL?
Question: I have used SPOOL command in Oracle SQL for storing query results into a file and when all is done, spool...How to Install Multiple Versions of Python (2.7 and 3.5) Without breaking System tools and Create Isolated environment using Virtualenv?
Today, I’m going to tell you how to install Python 2.7 and 3.5 versions on CentOS 6.4. And we are...[Solved]: dig: command not found – How to install dig on CentOS/Redhat/Fedora Linux using yum
Question: I followed your tutorial – how to identify the DNS server IP address configured on my CentOS 6 using the dig...[Solved]: Why rsync didn’t copy Hidden files/directories and Why asterisk does not include hidden(dot) files in Linux?
I used rsync command to copy a particular user directory from one storage device to another. The operation completed successfully without...How to Solve ImportError: No module named ConfigParser?
Question: I was stuck with an error ImportError: No module named ConfigParser when I run packstack command in CentOS. Below is the complete...ConfigParser Installation Error – python setup.py egg_info failed with error code 1 [Solved]
Error: The packstack command failed with an error message as “ImportError: No module named ConfigParser”. So I tried installing ConfigParser...Error: md5 validation failed for PyYAML-3.11.zip possible download problem? [Solution]
Question: I was installing Packstack and was hit with an error “error: md5 validation failed for PyYAML-3.11.zip; possible download problem?“....4 Ways to Find Out a CPU Core that is running a particular Process in Linux
Question: I would like to know if there’s a command in Linux (may be in CentOS, RedHat or Fedora) that...How to generate Checksum of a file with different SHA2 Hash functions in Linux and Windows
Checksums are hashes used to confirm both the file integrity and authenticity. A Hash is not ‘encryption’. It is (sometimes...How to Find Which Package an Executable or File belongs to in RedHat/CentOS/Fedora?
Question: I would like to know if there’s a command in CentOS that allows me to find which package an executable...How to Change the Timezone Settings in Linux?
Question: I would like to know the steps to change the default Timezone in Linux. I have CentOS 6.7 installed and...How to Check if SSL Certificate is SHA1 or SHA2 using OpenSSL?
Question: How to check if a particular website is using SHA1 or SHA2 Certificate? I would like to know the...How to guide for cracking Password Hashes with Hashcat using dictionary method
We saw from our previous article How to install Hashcat. Also we saw the use of Hashcat with pre-bundled examples....Upgrading PHP 5.x to PHP 7.0 on CentOS/RedHat server using Yum
From our earlier posts, you would have seen How to upgrade to php-5.5 using remi repository. Today we shall see...PHP Startup Error : Unable to load dynamic library, wrong ELF class: ELFCLASS64 [Solved]
PHP thrown this error PHP Warning: PHP Startup: Unable to load dynamic library wrong ELF class: ELFCLASS64, while installing Composer on...How to Install Composer, the PHP Dependency Manager?
Composer is a dependency manager for PHP, which allows you to require all dependant libraries for a particular project. In...How to Install and use Hashcat for password recovery on Linux : [Cyber Forensics]
Hashcat is an advanced CPU-based password recovery utility available for Windows, Mac and Linux. It provides 7 unique modes of...How to Use RedHat Upgrade Tool to Upgrade CentOS from 6.x to CentOS 7?
Have you been waiting for this? At least, I had been. I’m not a big fan of uninstalling the entire...Python Installation Error – Sorry: UnicodeError: escapes not supported can’t load unicodedata module [Solved]
Question: I was compiling Python from source and during ‘make install’, the installation failed with an error message as Sorry:...