If you’ve forgotten the MySQL password for the root user, we’ve got you covered in this guide. Follow our step by step instructions to reset the root password on a Linux system via the command line.
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Have you even been in the situation where you were running a 3 hour copy or script on a remote machine, only to find that it broke at 2h 45min because your network connection or SSH connection dropped momentarily? If so, you know how painful that feels 🙂 Welcome to GNU screen, the utility which allows you to start a separate shell which will not be interrupted if your network connection breaks. Read on to discover how to use it and more!
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Like all Linux distros, it’s important to keep your CentOS system up to date in order to make sure that you have the latest security updates and newest features. Updating the system usually involves simply upgrading all installed packages to their latest versions. Every few years, there’s a new version of CentOS released, which requires a more involved update process to install.
In this article, we’ll cover updating a CentOS system on a per package basis and upgrading the entire operating system. This can be done via command line and GUI. Both methods will be shown in this guide, so you can pick whichever is easier for you.
The process for upgrading a CentOS system is a little different depending on which version you have installed. The latest version of Centos has moved to the dnf package manager. Previous to Centos 8, yum was the package manager used. Regardless of which version you’re running, we’ll show you the proper commands so you can update your system.
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User management is an important part of Linux administration, so it’s essential to know about all the user accounts on a Linux system and how to disable user accounts, etc. In this guide, we’ll show you how to list the current users via command line and GUI. This will include a GNOME desktop environment as well as KDE.
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There are times when it’s useful to inspect what a running application is doing under the hood, and what system calls it is performing during its execution. To accomplish such a task on Linux, we can use the strace utility. In this article we will see how to install it and we will learn its basic usage.
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Systemd is nowadays the init system adopted by almost all Linux distributions, from Red Hat Enterprise Linux to Debian and Ubuntu. One of the things that made Systemd the target of a lot of critics is that it tries to be a lot more than a simple init system and tries to re-invent some Linux subsystems.
The traditional logging system used on Linux, for example was rsyslog, a modern version of the traditional syslog. Systemd introduced its own logging system: it is implemented by a daemon, journald, which stores logs in binary format into a “journal”, which can be queried by the journalctl utility.
In this tutorial we will learn some parameters we can use to modify the journald daemon behavior, and some examples of how to query the journal and format the output resulting from said queries.
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In previous articles, we already talked about how we can perform local and remote backups using rsync and how to setup the rsync daemon. In this tutorial we will learn a very useful technique we can use to perform incremental backups, and schedule them using the good old cron.
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When we decide to install an operating system based on the Linux kernel, the first thing we do is to download its installation image, or ISO, from the official distribution website. Before proceeding with the actual installation, however, it is crucial to verify the integrity of the image, to be sure it is what it claims to be, and nobody has compromised it. In this tutorial we will see the basic steps we can follow to accomplish this task.
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There are many reasons why you may want to create compressed encrypted file archives. You may want to create an encrypted backup of your personal files. Another possible scenario is that you may want to privately share content with a friend or colleague over the web or through cloud storage. Tar.gz files, or compressed tarballs, are created using the tar command. These tarballs are pretty much the standard go-to format for archives on GNU/Linux, however they are not encrypted. In the above scenarios that we mentioned it is often desirable to have encryption in order to secure your data. This is where gpg comes in.
Using xargs, described in the Linux xargs manual as a tool which builds and execute command lines from standard input, once can exert a significant amount of additional power over any other command executed on the Bash command line. Basically, xargs will take the output from any other tool, and use that as it’s own input for further processing and action (hence the reference to executing command lines in the manual). If this is your first few weeks or months with xargs, or you are only just starting, this is the best place for you to get into xargs.
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xargs from the command line in Bashxargs works, what it does, and how to use it wellxargs from the command line in Bash
When using random numbers in Bash, the question of random entropy will sooner or later come up. This article will help you understand what entropy is, how it can be modified and optimized in Bash, and how it will affect random number generation.
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Using regular expressions in Bash provides you with plenty of power to parse nearly every conceivable text string (or even full documents), and transform them into nearly any output desirable. If you regularly use Bash, or if you regularly work with lists, textual strings, or documents in Linux, you will find that many jobs can be simplified by learning how to use regular expressions in Bash. Continue reading to learn basic Bash regular expression skills! If you are already familiar with basic regular expressions in Bash or another coding language, see our more advanced bash regular expressions. If not, continue reading to learn basic Bash regular expression skills!
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