Taha tmkdam

This can be used to daemonize anything that would normally run in the foreground; I picked Redis. Put this in /etc/systemd/system/redis.service:

[Unit]
Description=Redis
After=syslog.target

[Service]
ExecStart=/usr/local/bin/redis-server /etc/redis/redis.conf
RestartSec=5s

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)

Reset mysql root password in Mac OS:

First Stop MySQL:

Go to: 'System Preferences' >> 'MySQL' and stop MySQL

OR,

sudo /usr/local/mysql/support-files/mysql.server start
sudo /usr/local/mysql/support-files/mysql.server stop

Autofs on Mac OS X

With autofs you can easily mount network volumes upon first access to the folder where you want to mount the volume. Autofs is available for many OS and is preinstalled on Mac OS X so I show you how I mounted my iTunes library folder using this method.

Prepare autofs to use a separate configuration file

autofs needs to be configured so that it knows where to gets its configuration. Edit the file '/etc/auto_master' and add the last line:

#
# Automounter master map
#

+auto_master # Use directory service

How to install OpenCV 3.4.1 with CUDA on Ubuntu distro

First of all install update and upgrade your system:

    $ sudo apt-get update
    $ sudo apt-get upgrade

Then, install required libraries:

	#!/bin/sh

	# 1) Install Xcode 11
	# 2) Install command line tools: `xcode-select --install`
	# 3) Install HomeBrew
	# 4) brew tap cartr/qt4 && brew install cartr/qt4/[email protected] subversion rbenv
	# 5) Setup rbenv
	# 6) Run this command

	PKG_CONFIG_PATH="$(brew --prefix cartr/qt4/[email protected])/lib/pkgconfig" \

	HTTP status code symbols for Rails

	Thanks to Cody Fauser for this list of HTTP responce codes and their Ruby on Rails symbol mappings.

	Status Code Symbol
	1xx Informational
	100 :continue
	101 :switching_protocols
	102 :processing

	require 'openssl'

	class String
	def encrypt(key)
	cipher = OpenSSL::Cipher.new('DES-EDE3-CBC').encrypt
	cipher.key = Digest::SHA1.hexdigest key
	s = cipher.update(self) + cipher.final

	s.unpack('H*')[0].upcase
	end

	{
	"AL": "Alabama",
	"AK": "Alaska",
	"AS": "American Samoa",
	"AZ": "Arizona",
	"AR": "Arkansas",
	"CA": "California",
	"CO": "Colorado",
	"CT": "Connecticut",
	"DE": "Delaware",

	#!/bin/bash
	# This gist is a step by step instructions to build and install OpenCV from source on ubuntu 18.04 LTS
	# note: The easy and quick way to install is
	# sudo pip3 install opencv-python
	# sudo pip3 install opencv-contrib-python
	# But this easy pypi installation can’t open video files on GNU/Linux distribution or on mac OS X system.
	# And on some system opencv binaries provided packages are not compiled.
	# Therefor we have no way rather than build it from source.