Understanding APT, APT-Cache and Their Frequently Used Commands

When it comes to gaining absolute control over your Linux system, then nothing comes close to the command line interface...

Patching OpenSSL for the Heartbleed Vulnerability

Patching OpenSSL for the Heartbleed Vulnerability A security vulnerability in OpenSSL dubbed Heartbleed has been found. This vulnerability was only...

PacVim – A Game That Teaches You Vim Commands

Although Vim (short for VI Improved) is a popular text editor on Linux systems, people still find it hard to...

How to Use 8 Useful ‘Debian Goodies Utilities’ to Manage Debian Packages

Debian-goodies is a package that includes toolbox-style utilities used to manage Debian and its derivative systems such as Ubuntu, Kali...

How to use a GPG key for SSH authentication

How to use a GPG key for SSH authentication You may be familiar with public key authentication for Secure Shell...

How to Find a Specific String or Word in Files and Directories

Do you want to find all files that contain a particular word or string of text on your entire Linux...

How to Change Runlevels (targets) in SystemD

Systemd is a modern init system for Linux: a system and service manager which is compatible with the popular SysV...

3 Ways to Delete All Files in a Directory Except One or Few Files with Extensions

Sometimes you get into a situation where you need to delete all files in a directory or simply cleanup a...

Control Network Traffic with iptables