Bash

From Wikipedia: The YubiKey is a hardware authentication device manufactured by Yubico to protect access to computers, networks, and online services that supports one-time passwords (OTP), public-key cryptography, and authentication, and the Universal 2nd Factor (U2F) and FIDO2 protocols developed by the FIDO Alliance.

To get up and running on a new machine with minimal fuss.

.bashrc

When you are not logged in via SSH, start the gpg-agent. Copy and paste into your terminal to append the configuration to your current .bashrc.

mtr combines the functionality of the traceroute and ping programs in a single network diagnostic tool.

bmon is a monitoring and debugging tool to capture networking related statistics and prepare them visually in a human friendly way.

ncdu (NCurses Disk Usage) is a curses-based version of the well-known du, and provides a fast way to see what directories are using your disk space.

Excerpt from tldr.sh: The tldr pages are a community effort to simplify the beloved man pages with practical examples.

Get more information at tldr-pages at GitHub.

Find all duplicate files in current and sub-directories with bash.

Removes all but current kernel and headers. This is a note for personal use. Use at your own risk :)

This is a small example how to use getopts in bash. I wrote it down for my own sake, as my own cheatsheet :)