My blog

Metadata at your fingertips! (finger)

Published on September 12, 2018 by Thomas Touhey.

Learn about finger, a forgotten Internet protocol allowing you to find out who is logged in on a server!

OpenSSH Public Key Authentication

Published on July 16, 2017 by Thomas Touhey.

Ever wondered how to authenticate on a custom SSH shell using the user's public key? You're at the right place!

Why the Unix return code is an int

Published on June 3, 2017 by Thomas Touhey.

Ever wondered why in C, main() returns an int? Here's my answer to that question!

Linux on the Thinkpad 750C

Published on May 22, 2017 by Thomas Touhey.

How did people back in the 90s installed Linux on their machines? Here's how I did on a PC from 1993, the IBM Thinkpad 750C!

stdarg.h and its secrets

Published on May 15, 2017 by Thomas Touhey.

How much do you know about stdarg.h? This post will give you some clues about how what's in it works.

Make a shell service, like in the 80s!

Published on December 14, 2016 by Thomas Touhey.

Ever wanted to make a shell service, just because it's cool ? Here's how I did mine!

fopencookie - make your own file streams!

Published on October 30, 2016 by Thomas Touhey.

Ever wondered if you could customize libc FILE streams? Here's how to do it with the GNU libc!