Cihat Altuntaş caltuntas

Understanding the Memory Layout of Linux Executables

Required tools for playing around with memory:

hexdump
objdump
readelf
xxd
gcore

Processing JSON using jq

jq is useful to slice, filter, map and transform structured json data.

Installing jq

On Mac OS

brew install jq

libevent vs libuv

Comparing libevent and libuv. My upfront biased: I want to like libevent. However, I want to objectively compare the two and make an informed decision.

What versions are we comparing?

libevent 2.0.22 (Stable) [2014-01-05]
libuv 1.8.0 (Stable) [2015-12-15]

Installing mailx

yum -y update

yum install -y mailx

We can now start sending e-mails using

Configuring mutt to work with gmail and yandex

Information used:

So, thanks to authors for ideas and detailed tutorials how to get it working.

Connecting to serial port (com port) over network

(Serial port or com port? - Serial ports are often refered as COM ports. It is the same to be short. You can read abut it in the Wiki article )

The problem
The solution in theory
WINDOWS
- Server
- Client

Driver Signature

Use wget to mirror a single page and its visible dependencies (images, styles)

Graphic via State of Florida CFO Vendor Payment Search (flair.myfloridacfo.com)

This is a quick command I use to snapshot webpages that have a fun image I want to keep for my own collection of WTFViz. Why not just right-click and save the image? Oftentimes, the webpage in which the image is embedded contains necessary context, such as captions and links to important documentation just incase you forget what exactly that fun graphic was trying to explain.

Directory structure for JavaScript/Node Projects

While the following structure is not an absolute requirement or enforced by the tools, it is a recommendation based on what the JavaScript and in particular Node community at large have been following by convention.

Beyond a suggested structure, no tooling recommendations, or sub-module structure is outlined here.

Directories

lib/ is intended for code that can run as-is
src/ is intended for code that needs to be manipulated before it can be used

	version: '2'

	services:
	db:
	image: mysql
	environment:
	- MYSQL_ROOT_PASSWORD=mypass
	- constraint:node==node01
	networks:
	- backend

	function Send-UdpDatagram
	{
	Param ([string] $EndPoint,
	[int] $Port,
	[string] $Message)

	$IP = [System.Net.Dns]::GetHostAddresses($EndPoint)
	$Address = [System.Net.IPAddress]::Parse($IP)
	$EndPoints = New-Object System.Net.IPEndPoint($Address, $Port)
	$Socket = New-Object System.Net.Sockets.UDPClient