Sam Mingo slmingol

Manually upgrade OpenSSH on OS 10.9.x

NOTE: Installation and testing was done on a clean Mavericks (OS 10.9) installation

Install Brew:

Install Homebrew prereqs:

xcode-select --install

Install Homebrew

mdadm

Glossary:

md: multiple devices

command	description
`cat /proc/mdstat`	show status of all raids
`mdadm --detail /dev/md0`	detailed status of raid md0

Routing tips for VPNs on OS X

When VPNs Just Work™, they're a fantastic way of allowing access to a private network from remote locations. When they don't work it can be an experience in frustration. I've had situations where I can connect to a VPN from my Mac, but various networking situations cause routing conflicts. Here are a couple of cases and how I've been able to get around them.

Specific cases

Case 1: conflicting additional routes.

In this example the VPN we are connecting to has a subnet that does not conflict with our local IP, but has additional routes that conflict in some way with our local network's routing. In my example the remote subnet is 10.0.x.0/24, my local subnet is 10.0.y.0/24, and the conflicting route is 10.0.0.0/8. Without the later route, I can't access all hosts on the VPN without manually adding the route after connecting to the VPN:

Getting the Gist of GitHub Actions

Tutorial and tips for GitHub Actions workflows

Terminal Colors

There exists common confusion about terminal colors. This is what we have right now:

Plain ASCII
ANSI escape codes: 16 color codes with bold/italic and background
256 color palette: 216 colors + 16 ANSI + 24 gray (colors are 24-bit)
24-bit true color: "888" colors (aka 16 milion)

	$ # Use Live CD to boot
	$ sudo su # Switch to root
	$ fdisk -l # Get names of root, boot & EFI partition names. you can also use blkid

	$ # http://dadadom.de/2020/04/11/fix-fedora-uefi-boot-with-encrypted-partitions/
	$ udiskctl unlock -b /dev/nvme0n1p6 # unlock root luks partition
	$ mount /dev/mapper/fedora_fedora-root /mnt # mount root partition
	$ mount /dev/mapper/fedora_fedora-var /mnt/var

	$ mount /dev/nvme0n1p5 /mnt/boot # mount boot partition

	# Gawk version
	# Remote
	grep -v "rem_address" /proc/net/tcp \| awk '{x=strtonum("0x"substr($3,index($3,":")-2,2)); for (i=5; i>0; i-=2) x = x"."strtonum("0x"substr($3,i,2))}{print x":"strtonum("0x"substr($3,index($3,":")+1,4))}'

	# Local
	grep -v "rem_address" /proc/net/tcp \| awk '{x=strtonum("0x"substr($2,index($2,":")-2,2)); for (i=5; i>0; i-=2) x = x"."strtonum("0x"substr($2,i,2))}{print x":"strtonum("0x"substr($2,index($2,":")+1,4))}'

	# No Gawk
	# Local
	grep -v "rem_address" /proc/net/tcp \| awk 'function hextodec(str,ret,n,i,k,c){

	#!/usr/bin/env bash
	## Copyright (C) 2017, Oleksandr Kucherenko
	## Last revisit: 2017-09-29

	# For help:
	# ./versionip.sh --help

	# For developer / references:
	# https://ryanstutorials.net/bash-scripting-tutorial/bash-functions.php
	# http://tldp.org/LDP/abs/html/comparison-ops.html