Tags: command line

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dnsmasq
In this tutorial, Carla Schroder looks at advanced configuration file management, how to test your configurations, and other tips and tricks.

Advanced Dnsmasq Tips and Tricks

Many people know and love Dnsmasq and rely on it for their local name services. Today we look at advanced configuration file management, how to test your configurations, some basic security, DNS wildcards, speedy DNS configuration, and some other tips and tricks. Next week, we'll continue with a...
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Don’t Fear the Regex: Getting Started on Regular Expressions

According to good ol’ Mozilla Developer Network, “Regular Expressions are patterns used to match character combinations in strings.”  Yes, strings as in text or — as the authors of Programming Perl point out — “If you take ‘text’ in the widest possible sense, perhaps 90 percent of what you do is 90...
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migration
New to Linux? Learn how to easily list, move, and edit files at the command line in this tutorial.

Migrating to Linux: The Command Line

This is the fourth article in our series on migrating to Linux. If you missed the previous installments, we’ve covered Linux for new users, files and filesystems, and graphical environments. Linux is everywhere. It's used to run most Internet services like web servers, email servers, and others. It...
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Unix: Dealing with Signals

On Unix systems, there are several ways to send signals to processes—with a kill command, with a keyboard sequence (like control-C), or through your own program (e.g., using a kill command in C). Signals are also generated by hardware exceptions such as segmentation faults and illegal instructions...
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Linux Fu: Custom Bash Command Completion

If you aren’t a Linux user and you watch someone who knows what they are doing use Bash — the popular command line interpreter — you might get the impression they type much faster than they actually do. That’s because experienced Linux users know that pressing the tab key will tend to complete what...
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network
Carla Schroder looks at how to use whois, dig, nmcli, and nmap to investigate networks.

4 Tools for Network Snooping on Linux

Computer networking data has to be exposed, because packets can't travel blindfolded, so join us as we use whois, dig, nmcli, and nmap to snoop networks. Do be polite and don't run nmap on any network but your own, because probing other people's networks can be interpreted as a hostile act. Thin...
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Working with Vi/Vim Editor: Advanced Concepts

Earlier we have discussed some basics about VI/VIM editor but VI & VIM are both very powerful editors and there are many other functionalities that can be used with these editors. In this tutorial, we are going to learn some advanced uses of VI/VIM editor. To open multiple files, command would...
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font size
Yes, you can change your Linux console fonts; Carla Schroder shows how.

How to Change Your Linux Console Fonts

I try to be a peaceful soul, but some things make that difficult, like tiny console fonts. Mark my words, friends, someday your eyes will be decrepit and you won't be able to read those tiny fonts you coded into everything, and then you'll be sorry, and I will laugh. Fortunately, Linux fans, you...
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A perf Cheat Sheet

Right now I’m working on finishing up a zine about perf that I started back in May, and I’ve been struggling with how to explain all there is to say about perf in a concise way. Yesterday I finally hit on the idea of making a 1-page cheat sheet reference which covers all of the basic perf command...
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The Linux Commands You Should Never Use

Unless, of course, you like killing your machines. Spider-Man's credo is, "With great power comes great responsibility." That’s also a wise attitude for Linux system administrators to adopt. No! Really! Thanks to DevOps and cloud orchestration, a Linux admin can control not merely a single server...
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