Hugefiver hugefiver

## file_magic_numbers.md

      
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                File Magic Numbers
              
          
    File Magic Numbers

Magic numbers are the first bits of a file which uniquely identify the type of file. This makes programming easier because complicated file structures need not be searched in order to identify the file type.
For example, a jpeg file starts with ffd8 ffe0 0010 4a46 4946 0001 0101 0047 ......JFIF.....G
ffd8 shows that it's a JPEG file, and ffe0 identify a JFIF type structure. There is an ascii encoding of "JFIF" which comes after a length code, but that is not necessary in order to identify the file. The first 4 bytes do that uniquely.
This gives an ongoing list of file-type magic numbers.
Image Files


## GnuPG-2.2.md

      
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                — forked from mattrude/GnuPG-2.1.md
            
              
                Build/install instructions for GnuPG 2.2.x on Ubuntu and similar distros (formerly for 2.1.x)
              
          
    GnuPG 2.2.x Build Instructions

Below are my build instructions for GnuPG 2.2.10, released on August 30th, 2018. These instructions are built for a headless Ubuntu 18.04 LTS server (and have also been tested on Ubuntu 14.04/16.04).
If you prefer, you may use the below install script to install GnuPG 2.2.x by running the following commands:
curl -OL "https://gist.githubusercontent.com/vt0r/a2f8c0bcb1400131ff51/raw/e0d2011d7b89bfe5b83c3f29f21949fb21354dd9/install-gnupg22.sh" && sudo -H bash ./install-gnupg22.sh
Install the needed dependencies


## 0-go-os-arch.md

      
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                Go (Golang) GOOS and GOARCH
              
          
    Go (Golang) GOOS and GOARCH

All of the following information is based on go version go1.17.1 darwin/amd64.
GOOS Values


GOOS
Out of the Box


aix
✅


android
✅


## ffmpeg.md

      
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                steven2358
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                FFmpeg cheat sheet
              
          
    FFmpeg cheat sheet

A list of useful commands for the FFmpeg command line tool.
Download FFmpeg: https://www.ffmpeg.org/download.html
Full documentation: https://www.ffmpeg.org/ffmpeg.html
Basic conversion


## gpg-ssh-setup.md

      
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                mcattarinussi
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                A setup guide to use a personal gpg key for ssh authentication
              
          
    GPG - SSH setup

Generating the master key

Here we create the master key. We want only Certify capability: we use the master key only to create the subkeys, Sign - Encrypt - Authenticate capabilities will be assigned to the subkeys.
Run the following command to start the master key generation process. Select the set your own capabilities creation process (type 8)
  ▶ gpg --full-generate-key --expert

gpg (GnuPG) 2.2.9; Copyright (C) 2018 Free Software Foundation, Inc.

  
## GnuPG-2.2.md

      
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                simbo1905
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                — forked from vt0r/GnuPG-2.2.md
            
              
                Build/install instructions for GnuPG 2.2.x on Centos 7 and similar distros (formerly for 2.1.x)
              
          
    GnuPG 2.2.x Build Instructions

Below are my build instructions for GnuPG 2.2.9, released on July 12th, 2018. These instructions are built for a headless Centos 7 LTS server (specificaly the openshift/base-centos7 docker image).
You use the below install script to install GnuPG 2.2.x by running the following commands:
# if you are root in a docker image:
curl -OL "https://gist.githubusercontent.com/simbo1905/ba3e8af9a45435db6093aea35c6150e8/raw/83561e214e36f6556fd6b1ec0a384cf28cb2debf/install-gnupg22.sh" && bash ./install-gnupg22.sh
# else if you need to sudo to do the installs:

  
## emulator-install-using-avdmanager.md

      
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                Installing and creating Emulators with AVDMANAGER (For Continuous Integration Server or Local Use)
              
          
    Install and Create Emulators using AVDMANAGER and SDKMANAGER

TL;DR

For an emulator that mimics a Pixel 5 Device with Google APIs and ARM architecture (for an M1/M2 Macbook):


List All System Images Available for Download: sdkmanager --list | grep system-images


Download Image: sdkmanager --install "system-images;android-30;google_atd;arm64-v8a"


## gnupg_scdaemon.md

      
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                artizirk
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                OpenPGP SSH access with Yubikey and GnuPG
              
          
    NB: This document describles a 'Old-School' way of using Yubikey with SSH

Modern OpenSSH has native support for FIDO Authentication. Its much simpler and should also be more stable with less moving parts. OpenSSH also now has support for signing arbitary files witch can be used as replacement of gnupg. Git also supports signing commits/tags with ssh keys.
Pros of FIDO


Simpler stack / less moving parts
Works directly with ssh, ssh-add and ssh-keygen on most computers
Simpler
Private key can never leave the FIDO device

Cons of FIDO


## ExportNetEaseMusicSongList.js
/**
* 使用方法：
* 1. 用 Chrome 打开歌单的 web 页面（可以通过分享拿到链接，链接类似这样：http://music.163.com/playlist?id=xxx&userid=yyy）
* 2. 然后右键“检查”（如果有左上角有 device 选项，需要选择 Laptop 开头的，可以在 Edit/编辑 里添加，添加的时候注意 “User Agent string” 里选择 Desktop）
* 3. 在 console 里输入下面脚本，即可输出 “歌曲名 - 歌手名” 格式的内容：

    Springsteen - Eric Church
    Chattahoochee - Alan Jackson
    Baby Now That I Found You - Alison Krauss
    Check Yes or No - George Strait

## README.md

      
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                WSL 2 - Enabling systemd
              
          
    Enable systemd in WSL 2

NOTE: If you have Windows 11 there is now an official way to do this in WSL 2, use it if possible - see MS post here (WINDOWS 11 ONLY)

This guide will enable systemd to run as normal under WSL 2. This will enable services like microk8s, docker and many more to just work during a WSL session. Note: this was tested on Windows 10 Build 2004, running Ubuntu 20.04 LTS in WSL 2.


To enable systemd under WSL we require a tool called systemd-genie


Copy the contents of install-sg.sh to a new file /tmp/install-sg.sh:
	/**
	* 使用方法：
	* 1. 用 Chrome 打开歌单的 web 页面（可以通过分享拿到链接，链接类似这样：http://music.163.com/playlist?id=xxx&userid=yyy）
	* 2. 然后右键“检查”（如果有左上角有 device 选项，需要选择 Laptop 开头的，可以在 Edit/编辑里添加，添加的时候注意 “User Agent string” 里选择 Desktop）
	* 3. 在 console 里输入下面脚本，即可输出 “歌曲名 - 歌手名” 格式的内容：

	Springsteen - Eric Church
	Chattahoochee - Alan Jackson
	Baby Now That I Found You - Alison Krauss
	Check Yes or No - George Strait