fredrick

#GNU Screen Cheat Sheet

##Basics

• ctrl a c -> cre­ate new win­dow
• ctrl a A -> set win­dow name
• ctrl a w -> show all win­dow
• ctrl a 1|2|3|… -> switch to win­dow n
• ctrl a " -> choose win­dow
• ctrl a ctrl a -> switch between win­dow
• ctrl a d -> detach win­dow

freeformz

A slightly updated version of this doc is here on my website.

Why I Like Go

I visited with PagerDuty yesterday for a little Friday beer and pizza. While there I got started talking about Go. I was asked by Alex, their CEO, why I liked it. Several other people have asked me the same question recently, so I figured it was worth posting.

Goroutines

The first 1/2 of Go's concurrency story. Lightweight, concurrent function execution. You can spawn tons of these if needed and the Go runtime multiplexes them onto the configured number of CPUs/Threads as needed. They start with a super small stack that can grow (and shrink) via dynamic allocation (and freeing). They are as simple as go f(x), where f() is a function.

betrcode

Using Python to check if remote port is open and accessible.

Taken from http://snipplr.com/view/19639/test-if-an-ipport-is-open/

Usage:

• Open a Python prompt
• Run the script in is_port_open.py
• Call isOpen with a host and a port parameter. Example: isOpen("www.google.com", 80)

leymannx

<?php
// How to create horizontal tabs programmatically in Drupal 8, requires Field Group module
$form = array();
$form['my_field'] = array(
  '#type' => 'horizontal_tabs',
  '#tree' => TRUE,
  '#prefix' => '<div id="unique-wrapper">',
  '#suffix' => '</div>',
);
$items = array(

michaellihs

Networking Cheat Sheet

Sniff Network Traffic from / to IP

tcpdump -n -i eth0 src SRC_IP  or dst DEST_IP

Create Routes

askz

#!/bin/bash
# The script will fail at the first error encountered
set -e

PASS=`pwgen -s 40 1`

mysql -uroot <<MYSQL_SCRIPT
CREATE DATABASE $1;
CREATE USER '$1'@'localhost' IDENTIFIED BY '$PASS';
GRANT ALL PRIVILEGES ON $1.* TO '$1'@'localhost';

jorislucius

<?php

namespace Drupal\<yourmodulename>\EventSubscriber;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpFoundation\RedirectResponse;
use Symfony\Component\HttpKernel\Event\GetResponseEvent;
use Symfony\Component\HttpKernel\KernelEvents;


/**

woprrr

    $field_updated = &$form['YOUR_FIELD_NAME'];
    $field_state = \Drupal\Core\Field\WidgetBase::getWidgetState($form['#parents'], $field_updated['widget']['#field_name'], $form_state);
    // You can change number of item to control the number of items we can change it with another field value into $form_state.
    if ($field_state['items_count'] >= 2) {
      $field_updated['widget']['add_more']['#access'] = FALSE;
    }
    $form['YOUR_FIELD_NAME'] = $field_updated;

harrietty

Ruby on Rails Cheatsheet (5.1)

Architecture

RVM

$ rvm list - show currently installed Rubies

stettix

Things I believe

This is a collection of the things I believe about software development. I have worked for years building backend and data processing systems, so read the below within that context.

Agree? Disagree? Feel free to let me know at @JanStette. See also my blog at www.janvsmachine.net.

Fundamentals

Keep it simple, stupid. You ain't gonna need it.