Tags: command line

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Jack Wallen discusses the command-line tools that are invaluable to the task of making configuration more efficient.

How to Effectively and Efficiently Edit Configuration Files in Linux

Every Linux administrator has to eventually (and manually) edit a configuration file. Whether you are setting up a web server, configuring a service to connect to a database, tweaking a bash script, or troubleshooting a network connection, you cannot avoid a dive deep into the heart of one or more...
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DNS dig utility
Chris Binnie wraps up his series on DNS with a look at some security options.

Dig into DNS: Part 4

Previously in this series (see links below), I’ve described the dig utility and its many uses in performing DNS lookups, along with several examples to help solve specific problems. In this final installment, I’ll look briefly at some security options and wrap up with additional examples. All...
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Docker layers
Docker’s inherent layering model gives its images the luxury of being lightweight and exceptionally performant.

Diffs and the Power of the Docker Layering Model

Recently I’ve been working more with the sophisticated tool that is Docker, and it hasn’t escaped me that the foundation of the DevOps world is essentially composed of layer after layer of diffs. For those readers who aren’t hard-core hackers, a diff in back-­in-­the-­day Unix terms simply means a...
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First 5 Commands When I Connect on a Linux Server

After half a decade working as a system administrator/SRE, I know where to start when I am connecting to a Linux server. There is a set of information that you must know about the server in order to properly, well most of the time, debug it. First 60 seconds on a Linux server These commands are...
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Snapshots
Snapper is a command-line program that allows you to create, delete, and compare snapshots of your filesystem.

How to Easily Roll Back Changes with Snapper

One thing a Linux sysadmin must know how to do is recover from a change gone bad. It happens. You install, upgrade, or configure a system or service and things immediately go wrong. What do you do? If you’ve made a copy of the configuration file, you’re okay. If the software didn’t install too many...
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dig utility
In the third part of this series, Chris Binnie looks at his favorite dig utility feature -- the “trace” option.

Dig into DNS: Part 3

In the first and second articles in this series, I introduced the powerful dig utility and its uses in performing DNS lookups along with a few time-saving examples of to put it into practice. In this part, I’ll look at my favorite dig utility feature -- which is definitely the “trace” option. For...
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dig utility
Chris Binnie explains how dig syntax differs from other DNS lookup packages and offers some time-saving examples.

Dig Into DNS: Part 2

In the first article in this series, I provided an introduction to the powerful dig utility and its uses in performing DNS lookups. For those who haven't used the command before, these articles will give a useful overview of its features and capabilities. This time, I’ll explain how dig syntax...
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dig utility
This series of articles will explore the dig DNS lookup tool and its many features and uses.

Dig Into DNS: Part 1

There’s little debate that one of the absolutely fundamental services critical to the functionality of the Internet is the Domain Name System (DNS). Akin to the Simple Mail Transfer Protocol (SMTP), which is the grounding for all things email, and the Network Time Protocol (NTP), which keeps the...
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Kate text editor
Kate is a user-friendly text editor with some powerful features.

Advanced Search and Replace with the Kate Text Editor

The powerhouse Kate text editor has advanced search-and-replace, including support for escape sequences and regular expressions, so you can make complex corrections without leaving your document. The Kate text editor is my favorite and has been my main workhorse for years. Kate has a lot of great...
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apt repository
Once you create your very own localized repository, apt can install any .deb file placed in the local repo directory and resolve the associated dependencies.

Create Your Own Local apt Repository to Avoid “Dependency Hell”

There are times when you download a .deb file that simply must be installed. Once on your machine, you run the dpkg command on the file only to find yourself in a quagmire of dependencies. Unfortunately, that necessary piece of software cannot be found in a standard repository. Instead of trying to...
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