Posts Tagged Computing

cron vs. systemd timers

Posted by Alex in Training on July 4, 2018

This is from the Chapter 4 about the process control of the “UNIX and Linux System Administration Handbook” – once again systemd ripples the waters and, IMO is almost a clear winner, despite the hesitation expressed by the book authors. systemd timers is a feature superset of cron, and rather huge one at that. Out […]

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sudo or not sudo

Posted by Alex in Training on July 3, 2018

Nothing prevents you from changing the username on this [root] account or from creating additional accounts whose UIDs are 0; however, these are both bad ideas. That was the most profound saying in probably the most boring chapter of the “UNIX and Linux System Administration Handbook”, Chapter 3, about the root account and related topics. […]

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System administration: How to start?

Posted by Alex in Training on July 1, 2018

Today, a good friend of mine Nikolai Dyumin, a seasoned PhD in mathematics, asked me of a recommended book on the Unix system administration topic. Immediately I recalled of the “Unix System Administration Handbook” by Evi Nemeth “and kids” paper back sample of the 2nd edition I have had and praised a lot since my […]

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32-bit or 64-bit for Linux desktop?

Posted by Alex in /var/log, News on February 5, 2013

Various Linux distros have long been offering both 32- and 64-bit options for download. While traditionally 64-bit was tout as “For more than 4GB of RAM”, those downloads are gradually becoming more common. So I decided to investigate a little deeper into what’s wrong with running 64-bit on smaller systems.

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Clean up EXIF tags in digital photos with 1-liner

Posted by Alex in Tools on February 7, 2012

Use the following one-line script to control witch EXIF data to leave in the photos published online: exiftool -P -overwrite_original -all= -tagsFromFile @ -ExposureTime -MeteringMode -Flash -FocalLength -FocalLengthIn35mmFormat -FocusDistance -VibrationReduction -FocusMode -CreateDate -DateTimeOriginal -ISO -FNumber -UserComment -copyright='(c)2011, Alexander Shcheblikin’ -artist=’Alexander Shcheblikin’ -model=”Sasha’s DX dSLR” _DSC*jpg This should all be entered on one line (note: the […]

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dataserv.exe: energy hog #1 from APC, not so “green”

Posted by Alex in /var/log on April 14, 2011

This service from APC is supposed to take care of calculating energy usage. The irony of this all is that this process holds one of the top positions in CPU hogs list. Take a look: it takes more CPU cycles than many of the most demanding processes in the system – virtual machines. (In other […]

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