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# http://ryanstutorials.net/regular-expressions-tutorial/
dot (.)   Match any character.
[ ]       Match a range of characters contained within the square brackets.
[^ ]      Match a character which is not one of those contained within the square brackets.
*         Match zero or more of the preceeding item.
+         Match one or more of the preceeding item.
?         Match zero or one of the preceeding item.
{n}       Match exactly n of the preceeding item.
{n,m}     Match between n and m of the preceeding item.
{n,}      Match n or more of the preceeding item.

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# Installing PostgreSql
|~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~|
| (bash)$ dnf install postgresql postgresql-server postgresql-contrib  |
| (bash)$ # Start PostgreSql database server                           |
| (bash)$ service postgresql initdb                                    |
| (bash)$ service postgresql start                                     |
| (bash)$ # Autostart PostgreSql on Boot                               |
| (bash)$ systemctl start postgresql service                           |
| (bash)$ systemctl enable postgresql service                          |
|~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~|

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 # Installing Mysql
 |~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~|
 | (bash)$ pacman -S mysql                                                       |
 | (bash)$ mysql_install_db --user=mysql --basedir=/usr --datadir=/var/lib/mysql |
 | (bash)$ sudo systemctl start mysqld                                           |
 |~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~|

 # Accesing Mysql
 |~~~~~~~~~~~~~~~~~~~~~~~~~~~~~|
 | (bash)$ mysql -u root -p    |

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$ wget -mkEpnp http://example.org

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$ heroku login
$ heroku create <appname> --stack cedar --region us --buildpack https://github.com/AdmitHub/meteor-buildpack-horse.git
$ heroku config:set MONGO_URL=mongodb://<username>:<password>@ds027308.mongolab.com:27308/<dbname>
$ heroku config:set ROOT_URL=<appname>.herokuapp.com
$ heroku git:remote -a <appname>
$ git push heroku master

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#!/usr/local/bin/python3.6
import requests
import feedparser
from urllib.parse import urljoin
from lxml import html

def findfeedWithLxml(site):
    raw = requests.get(site).content
    result = []
    possibleFeeds = []

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#!/bin/bash
# https://unix.stackexchange.com/questions/92445/bash-script-check-if-a-variable-is-in-a-z

# Exampl1
echo -e "Enter a character: \c"
read value
# LC_ALL=C  or LANG=C
case $value in
    [a-z] )
        echo "$value => a to z" ;;

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$ vim ~/.spacemacs
...
...
;; Default font, or prioritized list of fonts. `powerline-scale' allows to
;; quickly tweak the mode-line size to make separators look not too crappy.                                                          
dotspacemacs-default-font '("Source Code Pro"
                :size 20                                        ;; In here
                :weight normal
                :width normal 
                :powerline-scale 1.1)

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For Slaves

You must install openssh-server to slave machines.

$ sudo apt-get install openssh-server

Then, restart sshd service

$ sudo systemctl restart sshd

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$ pacaur -Syu
:: editor variable unset
$ export EDITOR='vim'
$ export VISUAL='vim'
$ pacaur -Syu
:: Synchronizing package databases...
 antergos is up to date
 core is up to date
 extra                                        1667.3 KiB   838K/s 00:02 [########################################] 100%
 community                                       3.9 MiB   634K/s 00:06 [########################################] 100%