chr15m’s gists

chr15m / picore-usb-tether.txt

Created July 2, 2018 12:39

Get USB tethering working on piCore (Tiny Core Linux)

	tce-load -wi net-usb-4.9.22-piCore-v7
	modprobe cdc_ether
	modprobe usbnet
	ifconfig -a
	ifconfig usb0 up
	sudo /sbin/udhcpc -b -i usb0 -x hostname:$HOSTNAME -p /var/run/udhcpc.usb0.pid

chr15m / browser-tab-communication-via-localstorage.html

Created June 8, 2018 12:43

Demo of communicating between tabs via the localStorage storage event

	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8">
	<meta content="width=device-width, initial-scale=1" name="viewport">
	<style>
	body {
	font-family: Arial, Sans-serif;
	max-width: 600px;
	margin: 1em auto;

chr15m / dht-ping.sh

Created May 6, 2018 09:24

BitTorrent mainline DHT UDP ping shell script example

echo -n $'d1:ad2:id20:\x23\x71\x0c\x1c\xb4\x50\x7d\x87\x29\xb8\x3f\x87\x2c\xc6\xa2\xa4\x4c\x39\x73\x67e1:q4:ping1:t1:01:y1:qe' | nc -u router.utorrent.com 6881

chr15m / xor-two-hex-strings.py

Created January 9, 2018 12:38

	#!/usr/bin/env python
	# two hex encoded strings coming in on stdin
	# will get xored and output as a hex encoded string
	import fileinput

	lines = [l for l in fileinput.input()]

	print hex(int(lines[0], 16) ^ int(lines[1], 16)).replace("0x", "").rstrip("L")

chr15m / pr

Created August 14, 2017 01:40

Open a GitHub pull-request page from the command line

	#!/usr/bin/env python

	import webbrowser
	import subprocess

	def git(*args):
	return subprocess.check_output(["git"] + list(args))

	remote, branch = git("rev-parse", "--abbrev-ref", "--symbolic-full-name", "@{u}").split("/")
	repo = git("config", "--get", "remote." + remote + ".url").split(":").pop().replace(".git", "").strip("\n")

chr15m / extract-latest-log-date.awk

Last active May 13, 2022 23:46

Extract only the latest log lines from apache/nginx logs

	#!/usr/bin/awk -f

	# Usage:
	# zcat -f access.log.* \| ./extract-latest-log-date.awk > latest-log.txt

	BEGIN {
	# pre-compute months field lookup
	m=split("Jan\|Feb\|Mar\|Apr\|May\|Jun\|Jul\|Aug\|Sep\|Oct\|Nov\|Dec",d,"\|")
	for(o=1;o<=m;o++){
	months[d[o]]=sprintf("%02d",o)

chr15m / find-pis

Created December 12, 2016 08:01

Find Raspberry Pi devices on your local networks.

	#!/bin/sh

	# get broadcast addresses for each network
	net=`ifconfig \| grep -o -E "Bcast:(.*?) " \| cut -f2 -d":"`

	# loop over networks running the scan
	for n in $net;
	do
	# first find SSH machines silently to prime the arp table
	nmap -T4 -n -p 22 --open --min-parallelism 100 "$n/24" \| grep -e "scan report for" -e "ssh" > /dev/null

chr15m / watch-make.sh

Created December 5, 2016 09:14

Shell script using make to watch a project and re-build on demand.

	#!/bin/sh

	while true;
	do
	if ! make -q "$@";
	then
	echo "#-> Starting build: `date`"
	make "$@";
	echo "#-> Build complete."
	fi

chr15m / expression-printer.hy

Last active June 28, 2016 12:24

Hy macro to print expression before evaluating it

	(import [hy.models.expression [HyExpression]])

	(defn print-expression [expr]
	(+ "(" (.join " " (list-comp (if (= (type x) HyExpression) (print-expression x) (str x)) [x expr])) ")"))

	(defmacro print-eval [expr]
	(quasiquote (do
	(print (unquote (print-expression expr)))
	(unquote expr))))

chr15m / set_timeout.cljs

Last active March 24, 2017 16:09

ClojureScript setTimeout that fires reliably in a background tab.

	; uses a web worker background thread
	(let [metronome-worker-js "self.onmessage=function(e){setTimeout(function(){postMessage(e.data);},e.data.interval);};console.log('Metronome worker loaded.');"
	worker-blob (js/Blob. (clj->js [metronome-worker-js]) {:type "application/javascript"})
	worker (js/Worker. (.createObjectURL js/URL worker-blob))
	call-id (atom 0)]

	(defn make-worker-listener [id callback]
	(fn [e]
	(when (= e.data.id id)
	(callback)

Chris McCormick chr15m