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Guide to Linux jq Command for JSON processing 1. Overview JSON is a widely used structured data format typically used in most modern APIs and data services. It’s particularly popular in web applications due to its lightweight nature and compatibility with Javascript. Unfortunately, shells such as Bash can’t interpret and… Continue Reading jq-command-json

Guide to Stream Redirections in Linux 1. Introduction Whenever we work on the Linux command line, we often have to pass data from one command to another, like feeding a list of find results into a grep. This is where streams come into play. In this tutorial, we’ll take a look at what… Continue Reading stream-redirections

Manipulating Strings in Linux with tr 1. Overview In this tutorial, we’ll see how to manipulate strings using the tr in Linux. Note that we’ve tested these commands using Bash, but should work on any POSIX-compliant terminal. 2. Lower Case to Upper Case First of all, let’s see the synopsis… Continue Reading tr-manipulate-strings

Linux Commands – Repeat a Command n Times 1. Introduction Repeating a command is one of the most commonly used operations when working with Linux scripting. In this quick tutorial, we’ll present how to perform an operation n times using different approaches. 2. Using a for Loop Let’s start by defining a… Continue Reading repeat-command

Setting Permissions with chown and chmod 1. Overview The Linux operating system is a multi-user operating system. It has a security system in place that controls which users and groups have access to the files and directories in the system. In this short tutorial, we’re going to have a look… Continue Reading chown-chmod-permissions

Generating SSH Keys in Linux 1. Overview In this tutorial, we’ll cover the basics of SSH keys and how to generate an SSH key pair in Linux. 2. Secure Shell (SSH) Secure Shell (SSH) is a secure remote login protocol that leverages public-key cryptography to encrypt the communication between a… Continue Reading generating-ssh-keys

How Long a Linux Process Has Been Running 1. Overview Linux comes with a handful of monitoring tools which can help us to get some insight about the OS itself. The ps utility from the Procps package is one of those tools which can report some stats about the current processes in the… Continue Reading process-running-time

Common Linux Text Search 1. Overview Searching text is a very common operation in Linux. For example, we want to find the files that contain specific text, or we want to find the lines within a file that contains specific text. In this tutorial, we’ll go through some examples together… Continue Reading common-text-search

Concatenating Files in Linux 1. Introduction Sometimes, we need to do some operations that require using multiple files at the same time. This can be something as common as searching for some text in multiple files or merging multiple files into a new one. In this quick tutorial, we’ll show… Continue Reading concatenating-files

Pipes and Redirection in Linux 1. Introduction Most shells offer the ability to alter the way that application input and output flows. This can direct output away from the terminal and into files or other applications, or otherwise reading input from files instead of the terminal. 2. Standard Input and… Continue Reading pipes-redirection