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ELF Format Cheatsheet

Introduction

Executable and Linkable Format (ELF), is the default binary format on Linux-based systems.

Compilation

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#!/bin/bash

# sudo apt-get install libzmq3-dev pkg-config
if [ ! -d .venv ] ; then
    uv venv --python 3.8
    source .venv/bin/activate
    pip install pybits/requirements.txt
fi
source .venv/bin/activate

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// $ cc -o checker checker.c
// $ ./checker
// $ ffmpeg -i output-%02d.ppm -r 60 output.mp4
#include <stdio.h>

int main()
{
    char buf[256];
    for (int i = 0; i < 60; ++i) {
        snprintf(buf, sizeof(buf), "output-%02d.ppm", i);

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#!/bin/sh

docker build -t tree-sitter-builder - <<EOF
# Dockerfile with caching optimizations for tree-sitter CLI
FROM ubuntu:18.04 AS builder

# RUN  sed -i s@/archive.ubuntu.com/@/mirrors.aliyun.com/@g /etc/apt/sources.list
# RUN  sed -i s@/deb.debian.org/@/mirrors.aliyun.com/@g /etc/apt/sources.list

# Install dependencies in a single layer for caching

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Cheef's Grand APDU List Smartcard Selected Information APDU list
Reference: http://web.archive.org/web/20090630004017/http://cheef.ru/docs/HowTo/APDU.info

#------------+------------------------+------------------------+----------------------+--------------------------------+
|ClaIns P1 P2|Lc Send Data            |Le  Recv Data           | Specification        | Description                    |
+------------+------------------------+------------------------+----------------------+--------------------------------+
|    04                                                        | ISO 7816-9 6.3       | DEACTIVATE FILE                |
| A0 04 00 00 00                                               | 3GPP TS 11.11        | INVALIDATE                     |
| A0 04 00 00 00                                               | SAGEM SCT U34 6.15   | INVALIDATE                     |
+------------+------------------------+------------------------+----------------------+--------------------------------+

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Developing Android apps without Android Studio (Debian 12)

If you're looking to develop an Android app you might be led to Android Studio. It's the IDE recommended and developed by Google for the express purpose of Android development. It does what it needs to, but if you look at the system requirements you will see some alarming numbers. If you're using an older system, or simply don't want to use AndroidStudio, this is the guide for you.

Installing packages

We won't be using many apt packages due to permissions issues and incompatible versions. That being said:

$ sudo apt install openjdk-17-jdk sdkmanager kotlin

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#!/bin/sh

docker build -t chardet-builder - <<EOF
# Dockerfile with caching optimizations
FROM alpine:3.18 AS builder

# Install dependencies in a single layer for caching
RUN apk add \
    musl-dev git make
RUN apk add \

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#!/bin/sh
# Credit: https://gist.github.com/Saoneth/02f08d4714e6fc035e7017c74b3ef29a
docker run -t \
    -e UID="$(id -u)" \
    -e GID="$(id -g)" \
    -v "$PWD":/w \
    -w /tmp \
    --rm \
    alpine \
    sh -c '

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#!/bin/sh
# Credit: https://gist.github.com/Saoneth/02f08d4714e6fc035e7017c74b3ef29a
docker run -t \
    -e UID="$(id -u)" \
    -e GID="$(id -g)" \
    -v "$PWD":/w \
    -w /tmp \
    --rm \
    alpine \
    sh -c "

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#!/bin/sh
# Credit: https://www.gkbrk.com/static-zstd-binary
docker run -t \
    -e UID="$(id -u)" \
    -e GID="$(id -g)" \
    -v "$PWD":/w \
    -w /tmp \
    --rm \
    -it \
    alpine:3.18 \