Dulani Woods Dulani

Docker Favorites

Build an image with a dockerfile: docker build - < Dockerfile

Add a name to the image (after building it):

docker tag <image ID> <image name>:latest

e.g. docker tag dbfee88ee9fd windowsservercore:latest

Set up the notebook so that it automatically hides the code chunks in the .nb.html:

output: 
  html_notebook:
    code_folding: hide

Print more table output rows for a particular chunk: {r, rows.print = 20}

refer to: https://stackoverflow.com/questions/39371772/how-to-install-anaconda-on-raspberry-pi-3-model-b

{USER}: pi

Install Miniconda 3:

wget http://repo.continuum.io/miniconda/Miniconda3-latest-Linux-armv7l.sh
sudo md5sum Miniconda3-latest-Linux-armv7l.sh # (optional) check md5
sudo /bin/bash Miniconda3-latest-Linux-armv7l.sh # -&gt; change default directory to /home/pi/miniconda3

How to set up a "Headless" Raspberry Pi with my typical configurations (and preferred tools).

Goal: To put all of my infrquently used setups stuff in one place. Tested on: A Pi2 B (arm6l) with a fresh Raspbian Buster OS

Setup the OS, connections, and logins

Download an OS image to another machine (currently Raspbian Buster Lite)
Unzip the image
Write the image to an SD card using Etcher.io
If it will connect via WiFi, add a wpa_supplicant.conf to the /boot partition. Source: https://www.raspberrypi.org/documentation/configuration/wireless/headless.md

Using arbitrary Leaflet JS plugins with Leaflet for R

The Leaflet JS mapping library has lots of plugins available. The Leaflet package for R provides direct support for some, but far from all, of these plugins, by providing R functions for invoking the plugins.

If you as an R user find yourself wanting to use a Leaflet plugin that isn't directly supported in the R package, you can use the technique shown here to load the plugin yourself and invoke it using JS code.


	#Reference: https://www.thomas-krenn.com/en/wiki/Headless_Mode_for_Virtual_Machines_of_VirtualBox
	#List available VMs:
	VBoxManage list vms

	#Run a particular VM in headless mode:
	$ VBoxHeadless -startvm ubuntu-server

	#Assuming port forwarding has been set up from 22 to 2222 (in the GUI):
	ssh -p 2222 <username>@localhost

	#!/bin/bash
	# --- Version history ---
	# mrn: sleep for $freq instead of 3 seconds (forked)
	# 0.4: added variable to store file path, and $2 for base file name
	# added variable to store desired reporting interval
	# 0.3: added $1 to send in process ID at run time.
	# 0.2: switched to $SECONDS for the loop. works.
	# 0.1: didn't work well at all.
	# --- Version history ---

	# push
	push <- function(x, values) (assign(as.character(substitute(x)), c(x, values), parent.frame()))

	# pop
	pop <- function(x) (assign(as.character(substitute(x)), x[-length(x)], parent.frame()))

	# example
	z <- 1:3
	push(z, 4)
	z

	#!/bin/sh

	# Get MacOSX idletime. Shamelessly stolen from http://bit.ly/yVhc5H
	/usr/sbin/ioreg -c IOHIDSystem \| /usr/bin/awk '/HIDIdleTime/ {print int($NF/1000000000); exit}'