If you ever connected to the Internet before the 2000s, you probably remember that it made a peculiar sound. But despite becoming so familiar, it remained a mystery for most of us. What do these sounds mean?

Generate graphic showing bgp route to get to a certain ip

Google recently released the deepdream software package for generating images like
https://github.com/google/deepdream

YTFS - File system which enables you to search and play movies from YouTube as files - with tools of your choice.

These commands can tell you what key bindings you have in your bash shell by default.

bind -P | grep 'can be'
stty -a | grep ' = ..;'

Self-contained C/C++ profiler library for Linux

SSH can use a variety of authentication methods, such as passwords and key pairs. Less common, and not particularly user friendly, are methods like OPIE. The latter is available per default in FreeBSD (and a few other BSDs I believe), but I can't recall a single case where I've seen it being used in the wild. Other implementations, like Google Authenticator make MFA easy to integrate and use, without being too disruptive for the user.