Searching for a pattern in files using grep is case-sensitive by default. Case sensitive means that grep looks for an exact match of your pattern in the related file. This may not surface all matches of the search value because of different writing styles for a given text. This tutorial …

The nano text editor is included in Debian-based operating systems. Because Ubuntu is based on Debian you’ll find nano pre-installed as well. The nano editor comes in handy when working in environments where you don’t have a user interface. For example, in server environments or using remote connections …

The ls command is essential when navigating a file system. ls displays files and directories in a given file system path. Yet, there’s a nuance when displaying files using the plain ls command: it’s not listing dotfiles. Dotfiles are the “hidden” files on your hard disk that start …

Certbot is part of the Let’s Encrypt family. You’re issuing your Let’s Encrypt SSL certificates through certbot. Certbot is software that you should keep track of during system maintenance. This tutorial shows you how to display the Certbot version number. {{outline}} Show Certbot Version on Ubuntu/Debian …

Occasionally you need to shut down or reboot your Linux servers. The Linux operating system comes with the built-in shutdown command. This command allows you to power off or reboot a computer. This tutorial shows you how to shut down or reboot a Linux machine. {{outline}} Shutdown Your Ubuntu/Debian …

In Linux, you can display a list of files and directories using the ls command. By default, ls prints the contents of a directory (files and folders) alphabetically in a column-like layout: $ ls CHANGELOG.md README.md lerna-debug.log node_modules package.json test LICENSE jest.config.js lerna.json …

Linux comes with the which command to locate a given executable. Executables are commands you type into your terminal, like git, node, touch, or vim. Sometimes, you want to find the location of an executable on your filesystem. That’s where the which command comes handy. Read on to find …

Recently, I provisioned a new Elasticsearch cluster. The installation process on Ubuntu used the apt package manager and everything looked good. I started the application as soon as Elasticsearch booted and was ready for connections. The app connected to the database, everything looked good. Yet, the Elastic SDK failed while …