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{
    "om_cmr": "/^6(5[5-9]|9|8[5-9])/",
    "momo_cmr": "/^6(5[1-4]|7|8[1-4])/",
    "momo_civ": "/^(05)/",
    "om_civ": "/^(07)/",
    "moov_civ": "/^(01)/",
    "wave_civ": "/^(0[157])/",
    "moov_ben": "/^(9[4589]|6[03458]|5[58])/",
    "moov_tgo": "/^(9[6-9]|79)/",
    "tmoney": "/^(70|9[0-3])/",

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KEYMAPOPTS="us us"
HOSTNAMEOPTS="-n alpine"
INTERFACESOPTS="auto lo
iface lo inet loopback

auto eth0
iface eth0 inet dhcp
    hostname alpine
"
TIMEZONEOPTS="-z UTC"

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PSQL

Magic words:

psql -U postgres

Some interesting flags (to see all, use -h or --help depending on your psql version):

• -E: will describe the underlaying queries of the \ commands (cool for learning!)
• -l: psql will list all databases and then exit (useful if the user you connect with doesn't has a default database, like at AWS RDS)

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Editing remote files in Vim with SSH

1. Configure SSH

   In ~/.ssh/config, include the lines:

   Host *
   ControlPath ~/.ssh/sockets/%r@%h-%p
   

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" for transparent background
function! AdaptColorscheme()
   highlight clear CursorLine
   highlight Normal ctermbg=none
   highlight LineNr ctermbg=none
   highlight Folded ctermbg=none
   highlight NonText ctermbg=none
   highlight SpecialKey ctermbg=none
   highlight VertSplit ctermbg=none
   highlight SignColumn ctermbg=none

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[
  {
    "name": "US Dollar",
    "symbol": "$",
    "symbolNative": "$",
    "decimalDigits": 2,
    "rounding": 0,
    "code": "USD",
    "namePlural": "US dollars",
    "countryEmoji": "🇺🇸"

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How to create an HTTPS certificate for localhost domains

This focuses on generating the certificates for loading local virtual hosts hosted on your computer, for development only.

Do not use self-signed certificates in production ! For online certificates, use Let's Encrypt instead (tutorial).

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Let's Encrypt / Dovecot / Postfix / UFW firewall / Certbot

This tutorial describes how to install TLS to a mail server consisting of Postfix and/or Dovecot by using Let's Encrypt certificates with automatic renewing and firewall management.

The system used for this tutorial was:

$ lsb_release -idrc
Distributor ID: Ubuntu

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The PATH is an important concept when working on the command line. It's a list of directories that tell your operating system where to look for programs, so that you can just write script instead of /home/me/bin/script or C:\Users\Me\bin\script. But different operating systems have different ways to add a new directory to it:

Windows

1. The first step depends which version of Windows you're using:

• If you're using Windows 8 or 10, press the Windows key, then search for and

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#!/bin/bash

################################################################################
###                       OpenCV2 Installation Script                        ###
################################################################################
#            Source code at https://github.com/arthurbeggs/scripts             #
################################################################################
#                                                                              #
#     Feel free to copy and modify this file. Giving me credit for it is your  #
# choice, but please keep references to other people's work, which I don't     #