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

in Categories Command Line Hacks, Howto, Python last updated December 9, 2017

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.

How to record statistics about a Linux machine’s uptime

in Categories Command Line Hacks, Hardware last updated November 15, 2017

Linux/Unix sysadmins have a weird obsession with server uptime. There is a xkcd comic devoted to this subject where a good sysadmin is an unstoppable force that it stands between the forces of darkness and your cat blog’s servers.
Fig.01: Devotion to Duty
One can tell how long the Linux system has been running using the uptime command or w command or top command. I can get a report of the historical and statistical running time of the system, keeping it between restarts using tuptime tool. Like uptime command but with the more impressive output. Recently I discovered another tool called uptimed that records statistics about a machine’s uptime. Let us see how to get uptime record statistics using uptimed and uprecords on Linux operating system.

Improve your bash/sh shell script with ShellCheck lint script analysis tool

in Categories Command Line Hacks, Howto, Programming last updated November 9, 2017

ShellCheck is a static analysis tool for shell scripts. One can use it to finds bugs in your shell scripts. It is written in Haskell. You can find warnings and suggestions for bash/sh shell scripts with this tool. Let us see how to install and use ShellCheck on a Linux or Unix-like system to enhance your shell scripts, avoid errors and productivity.

The Librem 5: Your Ultimate GNU/Linux FLOSS Smartphone

in Categories Linux News, Mobile Devices last updated August 24, 2017

Purism is well known for Linux based laptop with Coreboot. Now they started a crowdfunding campaign today for its smartphone called Purism Librem 5. What is so special about this phone? It is 100% powered by GNU/Linux. You can run any Linux distro on it. The phone provides high security and privacy features, i.e., it does not track you. This seems like an excellent device. One that I would certainly purchase or recommend to a privacy-conscious person.

I put a cronjob in /etc/cron.{hourly,daily,weekly,monthly} and it does not run and how can I troubleshoot it?

in Categories Cloud Computing, Howto, Open Source, Web Developer last updated August 27, 2017

Recently I created a simple shell script called in /root/scripts directory to just backup MySQL database and dumped it to /nfs/mysql/ directory. I put a file (more like used the ln command to create a soft link ) in /etc/cron.hourly/ and it doesn’t run. There was no error in systemd log or cron log. Why is my cron job was not working, and here is how I troubleshoot it.

OpenSSL drops TLS 1.0/1.1 support for Debian Unstable and what does it mean for Debian sid users?

in Categories Debian Linux last updated August 7, 2017

From the announcement mailing list:

I’ve just uploaded a version of OpenSSL to unstable that disables the TLS 1.0 and 1.1 protocol. This currently leaves TLS 1.2 as the only supported SSL/TLS protocol version.

This will likely break certain things that for whatever reason still don’t support TLS 1.2. I strongly suggest that if it’s not supported that you add support for it, or get the other side to add support for it.

OpenSSL made a release 5 years ago that supported TLS 1.2. The current support of the server side seems to be around 90%. I hope that by the time Buster releases the support for TLS 1.2 will be high enough that I don’t need to enable them again.