Debian Linux 9.9 released and here is how to upgrade it

last updated in Categories Debian Linux, Linux News

The Debian GNU/Linux project has released an updated version of its stable Linux distribution Debian 9 (“stretch”). You must upgrade to get corrections for security problem as this version made a few adjustments for the severe issue found in Debian version 9.9. Debian is a Unix-like (Linux distro) operating system and a distribution of Free Software. It is mainly maintained and updated through the work of many users who volunteer their time and effort. The Debian Project was first announced in 1993 by Ian Murdock.

400K+ Exim MTA affected by overflow vulnerability on Linux/Unix

last updated in Categories Linux News, Security

Exim is a free and open source message transfer agent (MTA) developed at the University of Cambridge. It is famous on Unix and Linux systems connected to the Internet. It is freely available under the terms of the GNU General Public Licence. There is a buffer overflow in base64d() of Exim MTA that allows an attacker to run code remotely. ALL versions of Exim MTA affected by overflow vulnerability i.e. CVE-2018-6789.
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Book Review: SSH Mastery – OpenSSH, PuTTY, Tunnels & Keys

last updated in Categories Open Source, Reviews, Security

Book Review: SSH Mastery
OpenSSH needs no introduction. OpenSSH is a free and open source suite of security-related software based on the SSH protocol. OpenSSH provides secure network communication and tunneling capabilities. OpenSSH gives peace of mind when communicating with Linux or Unix-like server over the Internet on the insecure network.

SSH is essential for both sysadmins and developers. The book “SSH Mastery” (2nd ed) talks about OpenSSH server, clients, encryption, public/private keys, VPNs and other security-related network-level utilities based on the Secure Shell SSH protocol.

How to use Chomper Internet blocker for Linux to increase productivity

last updated in Categories Command Line Hacks

Chomper is a free and open source Python cli for Linux desktop. It lets you block access to distracting websites for specified periods of time. The program is intended to help you with issues being productive on a desktop due to Internet distractions. One can set a period to block websites. Until that timer expires, you will be unable to access sites.

Deleting all existing comment author urls in WordPress using mysql command

last updated in Categories Command Line Hacks, Howto, Programming, Web Developer

I have like over 50k+ comments posted on this site. A commenter is allowed to leave their website or Github/Twitter URL in the comment section. Unfortunately, many websites are dead creating a mess. Many are just spam and nothing else. This is not good for anyone. Here is a quick way to delete all existing comment author URLs in WordPress using mysql command line option.

Monitor Linux CPU temperature, frequency, power in a graphical way

last updated in Categories Command Line Hacks, Howto, Python


S-tui is a free and open source terminal UI for monitoring your computer. s-tui allows to monitor CPU temperature, frequency, power and utilization in a graphical way from the terminal. It is written in Python and need root permission to use the s-tui. It is useful for:

  1. Watch your CPU temperature/utilization/frequency/power
  2. See performance dips caused by thermal throttling
  3. No need to use X-server. Perfect for headless usage including Raspberry PI

Let us see how to install and use s-tui on a Linux based system.

Book review Mastering Vim Quickly From WTF to OMG in no time

last updated in Categories Reviews


The vim editor is a free and open source text editor. It is a clone of vi text editor. Vim is extremely popular among the Linux, macOS and Unix-like system users. Vim has many commands. It comes with a pretty extensive built-in manual too. One might get lost in the built-in manual. Let us see if “Mastering Vim Quickly From WTF to OMG in no time” can help a new or experienced vim user to increase productivity.