Hoàng hoang-himself

Opening and closing an SSH tunnel in a shell script the smart way

I recently had the following problem:

From an unattended shell script (called by Jenkins), run a command-line tool that accesses the MySQL database on another host.
That tool doesn't know that the database is on another host, plus the MySQL port on that host is firewalled and not accessible from other machines.

We didn't want to open the MySQL port to the network, but it's possible to SSH from the Jenkins machine to the MySQL machine. So, basically you would do something like

ssh -L 3306:localhost:3306 remotehost

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

Exporting your 2FA tokens from Authy to transfer them into another 2FA application

IMPORTANT - Update regarding deprecation of Authy desktop apps

Past August 2024, Authy stopped supported the desktop version of their apps:
See Authy is shutting down its desktop app | The 2FA app Authy will only be available on Android and iOS starting in August for details.

And indeed, after a while, Authy changed something in their backend which now prevents the old desktop app from logging in. If you are already logged in, then you are in luck, and you can follow the instructions below to export your tokens.

If you are not logged in anymore, but can find a backup of the necessary files, then restore those files, and re-install Authy 2.2.3 following the instructions below, and it should work as expected.

How to think about Monads

UPDATE 2021: I wrote this long before I wrote my book Functional Programming Made Easier: A Step-by-step Guide. For a much more in depth discussion on Monads see Chapter 18.

Initially, Monads are the biggest, scariest thing about Functional Programming and especially Haskell. I've used monads for quite some time now, but I didn't have a very good model for what they really are. I read Philip Wadler's paper Monads for functional programming and I still didnt quite see the pattern.

It wasn't until I read the blog post You Could Have Invented Monads! (And Maybe You Already Have.) that I started to see things more clearly.

This is a distillation of those works and most likely an oversimplification in an attempt to make things easier to understand. Nuance can come later. What we need when first le

We did it! We broke gist.github.com ;) So head over to the new home! Thank you all!
2021.10.20: https://github.com/AveYo/MediaCreationTool.bat now open for interaction

Not just an Universal MediaCreationTool wrapper script with ingenious support for business editions,

A powerful yet simple windows 10 / 11 deployment automation tool as well!

discuss on MDL

	#!/usr/bin/python
	"""
	Simple tool to extract local users and passwords from most Huawei routers/firewalls config files.
	Will extract plain-text passwords and crypted credentials. Huawei config files use DES encryption with
	a known key. Using this information, the script will decrypt credentials found in the config file.
	Author: Etienne Stalmans ([email protected])
	Version: 1.0 (12/01/2014)
	"""

	from Crypto.Cipher import DES

	//usr/bin/env go run $0 "$@"; exit
	package main

	import (
	"fmt"
	"os"
	)

	func main() {
	fmt.Println("Hello world!")

	import java.io.FileDescriptor;
	import java.io.FileOutputStream;
	import java.io.IOException;
	import java.io.OutputStream;
	import java.io.PrintStream;

	public class HelloWorld{
	private static HelloWorld instance;
	public static void main(String[] args){
	instantiateHelloWorldMainClassAndRun();

	Byobu is a suite of enhancements to tmux, as a command line
	tool providing live system status, dynamic window management,
	and some convenient keybindings:

	F1 * Used by X11 *
	Shift-F1 Display this help
	F2 Create a new window
	Shift-F2 Create a horizontal split
	Ctrl-F2 Create a vertical split
	Ctrl-Shift-F2 Create a new session

	///$(which true);FLAGS="-g -Wall -Wextra --std=c17 -O1 -fsanitize=address,undefined";THIS_FILE="$(cd "$(dirname "$0")"; pwd -P)/$(basename "$0")";OUT_FILE="/tmp/build-cache/$THIS_FILE";mkdir -p "$(dirname "$OUT_FILE")";test "$THIS_FILE" -ot "$OUT_FILE" \|\| $(which clang \|\| which gcc) $FLAGS "$THIS_FILE" -o "$OUT_FILE" \|\| exit $?;exec bash -c "exec -a \"$0\" \"$OUT_FILE\" $([ $# -eq 0 ] \|\| printf ' "%s"' "$@")"
	#include <stdio.h>

	int main() {
	printf("Hello world!\n");
	return 0;
	}