Category: Linux

Link: 11 Cron Scheduling Task Examples in Linux

In this article we are going to review and see how we can schedule and run tasks in the background automatically at regular intervals using Crontab command. Dealing a frequent job manually is a daunting task for system administrator. Such process can be schedule and run automatically in the background without human intervene using cron daemon in Linux or Unix-like operating system.

For instance, you can automate process like backup, schedule updates and synchronization of files and many more. Cron is a daemon to run schedule tasks. Cron wakes up every minute and checks schedule tasks in crontable. Crontab (CRON TABle) is a table where we can schedule such kind of repeated tasks.

Full article here:
11 Cron Scheduling Task Examples in Linux (Tecmint)

Link: How to identify video formats from command line on Linux

If you want to know what video/audio codec are used for the video file you downloaded from somewhere, you can play the video itself. Most media player software such as VLC or MPlayer can display properties of a video file being played. However, there are command-line utilities that allow you to determine video properties quickly.

In this tutorial, I will describe how to check video formats from the command line on Linux.

Full article here:
How to identify video formats from command line on Linux (Xmodulo)

Link: How to make a DIY home alarm system with a raspberry pi and a webcam

How to make a DIY home alarm system with a raspberry pi and a webcam

Convert a simple webcam to a fancy digital peephole viewer with motion detection features

Traditional wireless CCTV cameras are cheap but anyone with a wireless receiver can view your signal. On the other hand, IP cameras are secure but they can be quite expensive and usually the video quality is poor — unless you go for a really expensive model.

Lately I wanted to install a home surveillance system so I chose to use a cheap Logitech webcam with Raspberry Pi and motion, an excellent linux program that monitors video signal for changes and triggers events.

Full article here:
How to make a DIY home alarm system with a raspberry pi and a webcam (medium.com)

Link: Repair Scanned Documents With gscan2pdf

I had the pleasure last week of tracking down an article locked behind a digital paywall. It arrived through inter-library loan in the form of a book, all issues of the journal that year bound together. I felt a little disappointed as it meant I’d be left with lower quality scans. (You know what I’m talking about if you’ve ever placed a book on a copy machine.) I turned to the internet for a solution and discovered the tool gscan2pdf.

Full article here:
Repair Scanned Documents With gscan2pdf (AMS Math Grad Student Blog)

Link: How to convert Apache rewrites for nginx

Apache is still by far the most widely deployed HTTP server, according to the latest Netcraft web server survey, but nginx has been slowly, steadily gaining market share, thanks to its blazing speed. If you want to try a faster web server and move from Apache to nginx, you’ll probably have to change some of your websites’ configurations, starting with rewrite directives. To migrate rewrite rules from Apache to nginx, start with these tips and tricks.

Full article here:
How to convert Apache rewrites for nginx (Linuxaria)

Link: How to clean up disk space on Linux

BleachBit is an open-source disk space cleaner software, available on Linux and Windows platforms. Besides cleaning up disk space, BleachBit can also shred files securely, and wipe out unallocated disk space for your privacy.

In this tutorial, I will describe how to clean up disk space on Linux by using BleachBit.

Full article here:
How to clean up disk space on Linux (Xmodulo)

Link: 5 Free Manuals On Ubuntu Distributions

Ubuntu is one community that will always lend you help for your problems and is extremely helpful but it is even better with Ubuntu documentation – you will find a user guide for each release. So here we will list other interesting books available for download.

Full article here:
5 Free Manuals On Ubuntu Distributions (EFYTimes.com)

Article series: CommandLineFu, BASH, AWK, Perl, SED One-Liners Explained

We must confess that we are not as fond of the Linux command line as some Linux users — we’ll take a good GUI, and a mouse over a keyboard any time we can. But for those that love working at the Linux command prompt (and that probably don’t make nearly as many typos as we do), we thought you might appreciate this series from the catonmat blog:

Or perhaps you’d prefer this series:

Or maybe you’d like to see one-liners covering Awk, Sed, or Perl:

 

 

Author Peteris Krumins used these articles as the starting points for his e-books. In addition to the e-books listed there, it appears that he has authored this paperback edition that can be purchased from Amazon (this is an affiliate link, so if you buy it from here we’ll get a small commission):

Perl One-Liners: 130 Programs That Get Things Done

Link: Port knocking: Enhance Security Using knockd and/or Iptables From Basics

Before moving into the article, let me tell you how this article has been written. This article starts with the introduction to knockd, and proceeds with the implementation of port knocking by using iptables. Note that the same port knocking can be achieved using knockd, as well, which will be discussed in the upcoming article.

Full article here:
Port knocking: Enhance Security Using knockd and/or Iptables From Basics (Unixmen)