Peter Šándor petersandor

preface: Posting these online since it sounds like these notes are somewhat interesting based on a few folks I've shared with. These are semi-rough notes that I basically wrote for myself in case I ever needed to revisit this fix, so keep that in mind.

I recently bought an LG ULTRAGEAR monitor secondhand off of a coworker. I really love it and it's been great so far, but I ran into some minor issues with it in Linux. It works great on both Mac and Windows, but on Linux it displays just a black panel until I use the second monitor to go in and reduce the refresh rate down to 60 Hz.

This has worked decent so far but there's some issues:

It doesn't work while linux is booting up. The motherboards boot sequence is visible just fine, but as soon as control is handed over to Linux and I'd normally see a splash screen while I'm waiting for my login window, I see nothing.
It doesn't work on the login screen. This would be fine if login consistently worked on my second screen, but I need to manually switch

Circumventing Deep Packet Inspection with Socat and rot13

I have a Linux virtual machine inside a customer's private network. For security, this VM is reachable only via VPN + Citrix + Windows + a Windows SSH client (eg PuTTY). I am tasked to ensure this Citrix design is secure, and users can not access their Linux VM's or other resources on the internal private network in any way outside of using Citrix.

The VM can access the internet. This task should be easy. The VM's internet gateway allows it to connect anywhere on the internet to TCP ports 80, 443, and 8090 only. Connecting to an internet bastion box on one of these ports works and I can send and receive clear text data using netcat. I plan to use good old SSH, listening on tcp/8090 on the bastion, with a reverse port forward configured to expose sshd on the VM to the public, to show their Citrix gateway can be circumvented.

Rejected by Deep Packet Inspection

I hit an immediate snag. The moment I try to establish an SSH or SSL connection over o

ANSI Escape Sequences

Standard escape codes are prefixed with Escape:

Ctrl-Key: ^[
Octal: \033
Unicode: \u001b
Hexadecimal: \x1B
Decimal: 27

jq will sort (-S) the whole file (.) and compare STDOUT (<()) with diff

diff <(jq -S . A.json) <(jq -S . B.json)

https://stackoverflow.com/questions/31930041/using-jq-or-alternative-command-line-tools-to-diff-json-files

Falsehoods programmers believe about time

This is a compiled list of falsehoods programmers tend to believe about working with time.

Don't re-invent a date time library yourself. If you think you understand everything about time, you're probably doing it wrong.

Falsehoods

There are always 24 hours in a day.
February is always 28 days long.
Any 24-hour period will always begin and end in the same day (or week, or month).

collapsible markdown?

CLICK ME

yes, even hidden code blocks!

print("hello world!")

	// Types for the result object with discriminated union
	type Success<T> = {
	data: T;
	error: null;
	};

	type Failure<E> = {
	data: null;
	error: E;
	};

	2teams() {
	NOW=$(date +"%Y-%m-%d_%H%M")
	if [ ! -z $2 ] ; then
	echo $NOW"_"$2.mp4
	ffmpeg -i $1 -codec copy $NOW"_"$2.mp4
	else
	echo $NOW"_teamsvid".mp4
	ffmpeg -i $1 -codec copy $NOW"_teamsvideo".mp4
	fi
	}

	import { TestBed, async } from '@angular/core/testing';
	import { AppComponent } from './app.component';
	import { setUpCachedTestBed } from '../test-utils';

	describe('AppComponent', () => {
	setUpCachedTestBed({
	declarations: [ AppComponent ],
	});

	beforeEach(() => {

	#!/usr/bin/env bash

	PLUGIN_BASE='/opt/cisco/secureclient/bin/plugins'

	read -r -d '' USAGE << EGASU
	Usage: `basename $0` [-s\|-e\|-d\|-h]

	-s, --status Print Umbrella Roaming Security module status
	-e, --enable Enable Umbrella Roaming Security module
	-d, --disable Disable Umbrella Roaming Security module