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"""
The most atomic way to train and run inference for a GPT in pure, dependency-free Python.
This file is the complete algorithm.
Everything else is just efficiency.
@karpathy
"""
import os # os.path.exists
import math # math.log, math.exp
@timothyham
timothyham / ipv6guide.md
Last active July 28, 2026 20:00
A Short IPv6 Guide for Home IPv4 Admins

A Short IPv6 Guide for Home IPv4 Admins

This guide is for homelab admins who understand IPv4s well but find setting up IPv6 hard or annoying because things work differently. In some ways, managing an IPv6 network can be simpler than IPv4, one just needs to learn some new concepts and discard some old ones.

Let’s begin.

First of all, there are some concepts that one must unlearn from ipv4:

Concept 1

@thesamesam
thesamesam / xz-backdoor.md
Last active August 4, 2026 03:38
xz-utils backdoor situation (CVE-2024-3094)

FAQ on the xz-utils backdoor (CVE-2024-3094)

This is a living document. Everything in this document is made in good faith of being accurate, but like I just said; we don't yet know everything about what's going on.

Update: I've disabled comments as of 2025-01-26 to avoid everyone having notifications for something a year on if someone wants to suggest a correction. Folks are free to email to suggest corrections still, of course.

Background

@Dan-Q
Dan-Q / _no_code_page_.php
Last active July 8, 2026 06:01
Hacky PHP to produce a "blank" web page which somehow has content when viewed in Firefox. Sample page at https://danq.me/wp-content/no-code-webpage/, explanation at https://danq.me/nocode
<?php
// half-hearted CSS minification
$css = preg_replace(
array('/\s*(\w)\s*{\s*/','/\s*(\S*:)(\s*)([^;]*)(\s|\n)*;(\n|\s)*/','/\n/','/\s*}\s*/'),
array('$1{ ','$1$3;',"",'} '),
file_get_contents('linked.css')
);
// embed as a data: uri
$base64css = rtrim(strtr(base64_encode($css), '+/', '-_'), '=');

Ansible: Nested and Dynamic Variables

This is a quick demo to show you how to use nested variables, then override them to make them useful in your playbooks.

Subscribe To Me On YouTube: https://bit.ly/lon_sub

Create a role

The first thing we do is create a new role to put our ansible code:

mkdir roles
@huytd
huytd / wordle.md
Last active March 26, 2026 21:25
Wordle in less than 50 lines of Bash

image

How to use:

./wordle.sh

Or try the unlimit mode:

@Neo23x0
Neo23x0 / log4j_rce_detection.md
Last active August 5, 2026 08:38
Log4j RCE CVE-2021-44228 Exploitation Detection

log4j RCE Exploitation Detection

You can use these commands and rules to search for exploitation attempts against log4j RCE vulnerability CVE-2021-44228

Grep / Zgrep

This command searches for exploitation attempts in uncompressed files in folder /var/log and all sub folders

sudo egrep -I -i -r '\$(\{|%7B)jndi:(ldap[s]?|rmi|dns|nis|iiop|corba|nds|http):/[^\n]+' /var/log
@motorailgun
motorailgun / idea.md
Last active July 27, 2026 06:23
Installing Windows and Linux into the same partition

Installing Windows and Linux into the same partition

But WHY?

There was a reddit post about installing Arch on NTFS3 partition. Since Windows and Linux doesn't have directories with same names under the /(C:\), I thought it's possible, and turned out it was actually possible.
If you are not familiar to Linux, for example you've searched on Google "how to dualboot Linux and Windos" or brbrbr... you mustn't try this. This is not practical.

Pre-requirements

  • UEFI system
  • Any Linux live-boot CD/DVD/USB... with Linux kernel newer than 5.15
  • Windows installer USB
@nrjdalal
nrjdalal / QEMU-Silicon-Mac-Virtualization.md
Last active August 3, 2026 20:30
Create Virtual Machines using QEMU on Silicon based Apple Macs

Install QEMU on Silicon based Apple Macs (June 2021)

Option 1 - Automatically

zsh -c "$(curl -fsSL https://raw.githubusercontent.com/nrjdalal/silicon-virtualizer/master/install-qemu.sh)"

Option 2 - Manually

  • Install Xcode command line tools

xcode-select --install
@citruz
citruz / QEMU_ON_M1.md
Last active May 20, 2026 21:41
Create Ubuntu and Windows VMs with QEMU on Apple Silicon

Running Linux and Windows on M1 with QEMU

30.11.2020: Updated with the new patchseries and instructions for Windows

02.12.2020: Added tweaks

08.12.2020: Updated with patchseries v4

31.01.2020: Updated with patchseries v6