kfox

TCP echo server for Node.js

Usage

1. Make sure you have a modern-ish version of Node.js installed.
2. Type npx https://gist.github.com/kfox/1280c2f0ee8324067dba15300e0f2fd3
3. Connect to it from a client, e.g. netcat or similar: nc localhost 9000

kfox

# Kernel sysctl configuration file for Red Hat Linux
#
# For binary values, 0 is disabled, 1 is enabled.  See sysctl(8) and
# sysctl.conf(5) for more details.

# Controls source route verification
net.ipv4.conf.default.rp_filter = 1

# Do not accept source routing
net.ipv4.conf.default.accept_source_route = 0

kfox

var net = require("net");

process.on("uncaughtException", function(error) {
  console.error(error);
});

if (process.argv.length != 5) {
  console.log("usage: %s <localport> <remotehost> <remoteport>", process.argv[1]);
  process.exit();
}

kfox

Convert a binary C64 character set to comma-delimited hex

1. Replace raw c64 character set with the file name of your raw binary Commodore 64 character set.
2. Paste the results into the dialog for the "import raw byte stream" prompt on the PETSCII Editor site by Krisztián Tóth.

cat "raw c64 character set" | \
  od -v -j 2 -t xC | \
  sed \
 -e 's/^.......//g' \

kfox

Keeping SCM accounts separate using asdf and direnv

These instructions will enable you to use different SSH keys for different accounts across different Source Code Management (SCM) providers like GitHub, Gitlab, and others, including internal on-prem versions of those providers. You can also use this approach to switch between multiple accounts for a single SCM provider, e.g. a personal Github account and a work Github account.

Installation and Setup

1. Install asdf by following the Getting Started instructions. asdf is the tool used to manage any number of versions of various programming language runtimes or environments. You can use asdf and the appropriate asdf plugins to replace separate tools like nvm, pyenv, rvm, etc.

2. Install the direnv plugin for asdf per these instructions. Direnv is the bit that "automagially"

kfox

#!/usr/bin/env ruby

# usage: saveimages.rb <url>
# locally save all images from a web site

require 'nokogiri'
require 'open-uri'

exit if ARGV[0].nil?

kfox

kfox

# in a git repo, compare your branch to another branch on github.com
# and optionally create a pull request

function gpr {
  local repo
  local branch
  local title

  repo=$(git ls-remote --get-url 2>/dev/null)
  branch=$(git branch --no-color --contains HEAD 2>/dev/null | awk '{ print $2 }')

kfox

eval $(xargs -0 -L1 -a /proc/1/environ | grep -E '^[A-Z].*' | sed -e 's/=/="/' -e 's/$/"/')

kfox

#!/usr/bin/env bash

affirmative_response_to() {
  PROMPT=$*

  IFS= read -n 1 -s -p "${PROMPT}? [Y/n]: " answer

  if [ "${answer:-Y}" = "${answer#[Yy]}" ]; then
    # anything other than enter, Y, or y was pressed
    echo "NO"