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5[0-9]{2}[0-9]{2}[A-Z]{1}[AEIOUX]{1}[A-Z]{2}[0-9]{2}(0[1-9]|1[0-2])(0[1-9]|1[0-9]|2[0-9]|3[0-1])[HM]{1}(AS|BC|BS|CC|CS|CH|CL|CM|DF|DG|GT|GR|HG|JC|MC|MN|MS|NT|NL|OC|PL|QT|QR|SP|SL|SR|TC|TS|TL|VZ|YN|ZS|NE)[B-DF-HJ-NP-TV-Z]{3}[0-9A-Z]{1}[0-9]{1}[0-1]{1}[0-9]{2}[0-9]{1}[1-9]{1}[0-9]{3}[0-1][1-9][0-3][0-9][0-9]{3}

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Table of Contents

1. Table of Contents
2. General Usage
3. File Spacing
4. Numbering and Calculations
5. Conversion and Substitution
6. Selective Printing
7. Selective Deletion

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#!/usr/bin/env bash

# Reduce size
ffmpeg -i <video.mp4> -vcodec h264 -acodec aac <video-output.mp4>

# Extract a audio fragment from another audio
ffmpeg -ss 00:00:30 -t 00:02:58 -i <input.mp3> -acodec copy <ouput.mp3>

# Extract audio from a video
ffmpeg -i <video.avi> -f mp3 <audio.mp3>

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SSL
1. 1-way SSL (a.k.a. Server Authentication)
    1. Client confirms the server’s identity via the server’s provided certificate by verifying it with a CA (Certificate Authority).
    2. Then the Public Key contained in the received certificate is used along the Session Key to encrypt all sent/received messages.
2. 2-way SSL (a.k.a. Client Authentication, Mutual Authentication)
    1. Server and Client confirm the other’s identity after each share their own public certificate by verifying it with a CA.
    2. Then the Public Key contained in the received certificate is used along the Session Key to encrypt all sent messages.


Keystore

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vimdiff cheat sheet

git mergetool

In the middle file (future merged file), you can navigate between conflicts with ]c and [c.

Choose which version you want to keep with :diffget //2 or :diffget //3 (the //2 and //3 are unique identifiers for the target/master copy and the merge/branch copy file names).

cmd	means

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#Heading 1 ##Heading 2 ###Heading 3 ####Heading 4 #####Heading 5 ######Heading 6

---

Paragraph

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Run Book / Operations Manual

1. Table of Contents
2. System Overview
   • Service Overview
   • Contributing Applications, Daemons, and Windows Services
   • Hours of Operation
   • Execution Design
   • Infrastructure and Network Design
   • Resilience, Fault Tolerance and High-Availability

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Programming Fonts

Input™

Fonts for code from DJR & Font Bureau

https://input.djr.com/

Sudo

A free font for coders by Jens Kutílek

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XQuartz & OS/X

1. Install XQuartz

$> brew install xquartz
Updating Homebrew...
==> Downloading https://github.com/XQuartz/XQuartz/releases/download/XQuartz-2.8.1/XQuartz-2.8.1.dmg
==> Downloading from https://github-releases.githubusercontent.com/201858552/97a77400-a5f0-11eb-90ad-2973b8c2dc53?X-Amz-Algorithm=AWS4-
######################################################################## 100.0%
==> Installing Cask xquartz

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Exporting a Compressed MySQL Dump

mysqldump -u {user} -p {database} | gzip > {database}.sql.gz

Importing a Compressed MySQL Dump

gzip -dc < {database}.sql.gz | mysql -u {user} -p {database}