Signal is a free and open source messaging application developed by the Signal Foundation: it is available on all the major operating systems such as Linux, Windows, Android and iOS, and supports all the major features one can expect, such as encryption, the ability to send files and make group calls. All the infrastructure behind Signal is open source, including the messaging protocol and the server software: the source code is available on github.
Commands
How to retrieve hardware information with dmidecode on Linux
Dmidecode is a free and open source utility we can use to retrieve hardware information on Linux. The tool is available in the repositories of all the major Linux distributions, and is able to inspect and dump the content of the SMBIOS table.
Basic Linux Commands
Linux beginners may get overwhelmed by the sheer number of commands that are available in the terminal, but most users will find themselves executing the same few commands over and over. If you are looking to get started with the Linux command line, we have listed 20 of the most important and basic commands that you should know. These basic commands are the most essential to learn, and also the ones you will likley find yourself using the most.
How to go to root directory in Linux
The root directory on a Linux system, which is represented by the / character, is the parent path to all files on the installation’s partition. All operating systems have a root directory. If you are familiar with Windows systems, they use the C:\ path as their root directory.
How to backup and restore an xfs filesystem using xfsdump and xfsrestore
XFS is a journaled filesystem originally developed by Silicon Graphics in 1993; it was released under the GPL license in the year 2000 and ported to the Linux kernel in 2001. Due to its high scalability and performances, XFS became the default filesystem in recent versions of Red Hat Enterprise Linux and its clones.
VIM tutorial for beginners
The Vim editor (and its predecessor, vi) is a command line editor for Linux systems. It has a long standing reputation as being the most powerful text editor on Linux. After mastering it, many users will even claim that it is far speedier and more convenient to use than a typical GUI editor packed with lots of features in its menus.
How to format data with Column in Linux
Column is a free and open source utility usually installed as part of the util-linux package in all the most common Linux distribution, and therefore included in even the most minimal installations. With this utility we can organize the content of files or the output of other commands in columns, creating pretty tables or even producing JSON formatted documents.
Curl command not found
If you encounter the curl command not found on a Linux system, it means that the tool has not yet been installed. The curl Linux command can use various network protocols to download and upload data on Linux. In this tutorial, you will see how to install the curl command on all major Linux distributions.
Using command line wodim tool to burn iso image
If you are looking to burn an ISO image to physical media such as a CD or DVD, instead of a conventional method using a GUI application, there are also many ways on how to burn an ISO image from the command line. One way is to use the wodim command. In this tutorial, we will cover the step by step instructions to burn an ISO image to disc using the wodim tool on a Linux system.
Curl command basics tutorial with examples
Curl is a free and open source software we can use to exchange data with servers using one of the many supported protocols, such as HTTP, HTTPS, FTP, FTP, SFTP. Since Curl is a command line tool, we can use it in our scripts, to automatize repetitive tasks, for example. There are many use-cases Curl can cover. In this tutorial, however, we see some of the most common ones.
How to integrate dialog boxes in shell scripts with Whiptail
The ability to create secure shell scripts is essential not only for system administrators, but also for users who wants to automate repetitive tasks. Sometimes, from our shell scripts, we need to provide the user with some kind of information, ask him/her to provide some input, choose from a set of alternatives, or just ask for his/her confirmation before performing a potentially dangerous operation. All those actions, can be performed from the command line, of course, but to make our scripts more user-friendly, we can use of Whiptail to customize and display textual widgets.
Regex match filename
The Linux command line comes with many options that we can use in order to search for files. One of the most powerful features is regex (regular expression) pattern matching. This convention allows us to search our file system based on very granular name patterns found inside the file names – for example, the ability to search for all files that start with an A and end with a K. In regex, this would be written ^A.*K$.