Abel Callejo abelcallejo

Creating a .pem file from scratch

ssh-keygen -t rsa -b 4096 -C "[email protected]"

Generating public/private rsa key pair.
Enter file in which to save the key (/home/bill/.ssh/id_rsa):

Creating `.pem` key using `id_rsa`

Copy-and-Paste the private key id_rsa file into a .pem file

cp /Users/bill/.ssh/id_rsa /path/to/bill.pem

Reference

unix.stackexchange.com, How to recycle existing id_rsa private and public key pair in generating a new pem/ppk file?

Adding new user accounts with SSH access

REMOTE MACHINE: Create a user and set the password
```
sudo adduser joel
sudo passwd joel
```
REMOTE MACHINE: Switch login to the newly created user
```
su - joel
```

is_posts_page()

Returns boolean whether the current page is the posts page as set from the dashboard.

Crash course and cheatsheets

Data types

In most programming languages, there are the so called "Data types". However in R, they are often referred to as Objects.

Primitive data types

In most programming languages, there are the so called "Primitive data types". However in R, they are often referred to as Atomic objects or sometimes called as "Basic types".

logical

PostgreSQL query to CSV using Bash

CSV generation

psql -h localhost -U user_name -w -d database_name -A -F"," -c 'SELECT * FROM table_name' > "/path/to/results.csv"

Getting rid of extra characters at the bottom of the CSV

Bootstrap break points

Version 3

/** Extra small (xs) **/
@media (max-width: 767px){
}

/** Small (sm) **/

Implementing Google reCAPTCHA with PHP

Implementation using v2

Step 1

Register a project by logging to google.com/recaptcha

Step 2

Load the javascript library

String Replace Cheatsheet

PHP

$replaced = str_replace( $search, $replace, $subject );

JavaScript

replaced = subject.replace( search, replace );

	<VirtualHost *:80>
	DocumentRoot "/var/www/html/site"
	ServerName site.example.com
	<Directory "/var/www/html/site">
	AllowOverride All
	</Directory>
	</VirtualHost>