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Reboot to {OS}

This a collection of notes and files used in my quest to create "Reboot to Windows" and "Reboot to Linux" scripts (and desktop shortcuts) for Linux and Windows respectively that automatically reboot my system and instruct rEFInd to auto-select the appropriate OS entry.

General Information

The key for achieving this is to modify the EFI Variable PreviousBoot with GUID 36d08fa7-cf0b-42f5-8f14-68df73ed3740, which rEFInd uses to store the last entry selected in the menu and, if using the + default entry, will be used to select the default OS. By doing this, we trick rEFInd into booting the OS we choose without having to be physically there to press the keyboard.

How to update the Go version

System: Debian/Ubuntu/Fedora. Might work for others as well.

1. Uninstall the exisiting version

As mentioned here, to update a go version you will first need to uninstall the original version.

To uninstall, delete the /usr/local/go directory by:

security and hardening options for systemd service units

A common and reliable pattern in service unit files is thus:

NoNewPrivileges=yes
PrivateTmp=yes
PrivateDevices=yes
DevicePolicy=closed
ProtectSystem=strict

Use curl to get the JSON response for the latest release
Use grep to find the line containing file URL
Use cut and tr to extract the URL
Use wget to download it

curl -s https://api.github.com/repos/jgm/pandoc/releases/latest \
| grep "browser_download_url.*deb" \
| cut -d : -f 2,3 \
| tr -d \" \

	First go here:

	https://wiki.codeaurora.org/xwiki/bin/QAEP/release

	This site gives information about all msm soc release details with tag + android version

	Search your msm here.. Check the latest one and look for correct android version and mark that tag.

	Now open one of the following links (dependent on your linux kernel version)

	To make good old Internet Download Manager (IDM) work in Linux mint / Ubuntu!

	# Declaration: I totally support open source and have tried aria2, and axel; also I am frequent user and admirer of wget, curl and lynx; but the download throughput provided by IDM is unmatched for some odd reasons, specifically it performs better than other clients in mid-to-high latency networks, who knows, may be short time-outs on each connectionns or magic wand.

	Some CLI examples if someone would wish to try those and compare throughput of each at 8 connections to get benchmark against IDM!

	- $ aria2c --file-allocation=none -c -x 8 -s 8 -d "./location/to/downloads/" http://cachefly.cachefly.net/100mb.test
	- $ axel -n 8 http://cachefly.cachefly.net/100mb.test

	Below two does not suppot multi-threaded, and are made for other greater purpose :)

	# /etc/systemd/system/iperf3.service
	# User service: $HOME/.config/systemd/user/iperf3.service

	[Unit]
	Description=iperf3 server
	After=syslog.target network.target auditd.service

	[Service]
	ExecStart=/usr/bin/iperf3 -s

	/play
	/*.png
	/*.bmp
	/solitaire


	get_latest_release() {
	curl --silent "https://api.github.com/repos/$1/releases/latest" \| # Get latest release from GitHub api
	grep '"tag_name":' \| # Get tag line
	sed -E 's/."([^"]+)"./\1/' # Pluck JSON value
	}

	# Usage
	# $ get_latest_release "creationix/nvm"
	# v0.31.4

	#!/bin/bash
	#
	# GoLang cross-compile snippet for Go 1.6+ based loosely on Dave Chaney's cross-compile script:
	# http://dave.cheney.net/2012/09/08/an-introduction-to-cross-compilation-with-go
	#
	# To use:
	#
	# $ cd ~/path-to/my-awesome-project
	# $ go-build-all
	#