Dovydas Venckus dovydasvenckus

Here is the best setup (I think so :D) for K-series Keychron keyboards on Linux.

Note: many newer Keychron keyboards use QMK as firmware and most tips here do not apply to them. Maybe the ones related to Bluetooth can be useful, but everything related to Apple's keyboard module (hid_apple) on Linux, won't work. As far as I know, all QMK-based boards use the hid_generic module instead. Examples of QMK-based boards are: Q, Q-Pro, V, K-Pro, etc.

Most of these commands have been tested on Ubuntu 20.04 and should also work on most Debian-based distributions. If a command happens not to work for you, take a look in the comment section.

Make Fn + F-keys work (NOT FOR QMK-BASED BOARDS)

Older Keychron keyboards (those not based on QMK) use the hid_apple driver on Linux, even in the Windows/Android mode, both in Bluetooth and Wired modes.

You have to do 2 things in order to allow your container to access your host's postgresql database

Make your postgresql listen to an external ip address
Let this client ip (your docker container) access your postgresql database with a given user

Obs: By "Host" here I mean "the server where docker is running on".

Make your postgresql listen to an external ip address

Find your postgresql.conf (in case you don't know where it is)

$ sudo find / -type f -name postgresql.conf

Create bootable USB

dd bs=4M if=/path/to/archlinux.iso of=/dev/sdx status=progress oflag=sync

Boot from USB and set prepare system

loadkeys <your-keymap>

Install pgAdmin4 v2.0 with python3 on Ubuntu 16.04 DESKTOP mode

Get Python Wheel pgAdmin4

 wget https://ftp.postgresql.org/pub/pgadmin/pgadmin4/v2.0/pip/pgadmin4-2.0-py2.py3-none-any.whl

Install pip3
```
 sudo apt install python3-pip
```

Docker - How to cleanup (unused) resources

Once in a while, you may need to cleanup resources (containers, volumes, images, networks) ...

delete volumes

// see: https://github.com/chadoe/docker-cleanup-volumes

$ docker volume rm $(docker volume ls -qf dangling=true)

$ docker volume ls -qf dangling=true | xargs -r docker volume rm

Virtual Hosts on nginx (CSC309)

When hosting our web applications, we often have one public IP address (i.e., an IP address visible to the outside world) using which we want to host multiple web apps. For example, one may wants to host three different web apps respectively for example1.com, example2.com, and example1.com/images on the same machine using a single IP address.

How can we do that? Well, the good news is Internet browsers

Installing BitTorrent Sync on a Raspberry Pi running Arch Linux

The commands below assume you're using a user that can use sudo, you're not logged in as root are you!?

First create a btsync user:

sudo useradd -M --shell /bin/false --home /var/lib/btsync

	package io.github.sandornemeth.spring;

	import java.util.Arrays;
	import java.util.stream.StreamSupport;

	import org.slf4j.Logger;
	import org.slf4j.LoggerFactory;
	import org.springframework.context.event.ContextRefreshedEvent;
	import org.springframework.context.event.EventListener;
	import org.springframework.core.env.AbstractEnvironment;

	# Maintainer: Meow < a.li.devtty at gmail dot com >

	# Get download links and md5 sums for latest version of RStudio desktop
	cat <<_EOF_ >/dev/null
	## R code #############
	require(XML)
	page = htmlTreeParse("http://www.rstudio.com/products/rstudio/download/",useInternalNodes = T)
	links = sapply(getNodeSet(page,'//table[@class="downloads"]/thead/tr/th[text()="Installers"]/../../..//a[contains(@href,".deb")]'),xmlGetAttr,'href')
	md5sums = sapply(getNodeSet(page,'//table[@class="downloads"]/thead/tr/th[text()="Installers"]/../../..//a[contains(@href,".deb")]/../..//code'),xmlValue)
	print(cbind(links,md5sums))

	#!/bin/bash
	#title :wildfly-install.sh
	#description :The script to install Wildfly 10.x
	#more :http://sukharevd.net/wildfly-8-installation.html
	#author :Dmitriy Sukharev
	#date :2016-06-18T02:45-0700
	#usage :/bin/bash wildfly-install.sh
	#tested-version1 :10.0.0.CR3
	#tested-distros1 :Ubuntu 15.10; Debian 7,8; CentOS 7; Fedora 22
	#tested-version2 :10.0.0.Final