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@pnc
pnc / observer.md
Last active April 1, 2025 21:38
Using Erlang observer/appmon remotely

Using OTP's observer (appmon replacement) remotely

$ ssh remote-host "epmd -names"
epmd: up and running on port 4369 with data:
name some_node at port 58769

Note the running on port for epmd itself and the port of the node you're interested in debugging. Reconnect to the remote host with these ports forwarded:

$ ssh -L 4369:localhost:4369 -L 58769:localhost:58769 remote-host
@grugq
grugq / gist:03167bed45e774551155
Last active June 17, 2025 15:52
operational pgp - draft

Operational PGP

This is a guide on how to email securely.

There are many guides on how to install and use PGP to encrypt email. This is not one of them. This is a guide on secure communication using email with PGP encryption. If you are not familiar with PGP, please read another guide first. If you are comfortable using PGP to encrypt and decrypt emails, this guide will raise your security to the next level.

#!/usr/bin/zsh
setopt ERR_EXIT
# cannot use PIPE_FAIL because we want to ignore mount efivarfs failure
# setopt PIPE_FAIL
msg() {
printf "==> $1\n" "${@:2}"
}
@lelandbatey
lelandbatey / whiteboardCleaner.md
Last active May 20, 2025 13:11
Whiteboard Picture Cleaner - Shell one-liner/script to clean up and beautify photos of whiteboards!

Description

This simple script will take a picture of a whiteboard and use parts of the ImageMagick library with sane defaults to clean it up tremendously.

The script is here:

#!/bin/bash
convert "$1" -morphology Convolve DoG:15,100,0 -negate -normalize -blur 0x1 -channel RBG -level 60%,91%,0.1 "$2"

Results

@XVilka
XVilka / TrueColour.md
Last active April 27, 2025 10:17
True Colour (16 million colours) support in various terminal applications and terminals

THIS GIST WAS MOVED TO TERMSTANDARD/COLORS REPOSITORY.

PLEASE ASK YOUR QUESTIONS OR ADD ANY SUGGESTIONS AS A REPOSITORY ISSUES OR PULL REQUESTS INSTEAD!

@debasishg
debasishg / gist:8172796
Last active June 23, 2025 05:56
A collection of links for streaming algorithms and data structures

General Background and Overview

  1. Probabilistic Data Structures for Web Analytics and Data Mining : A great overview of the space of probabilistic data structures and how they are used in approximation algorithm implementation.
  2. Models and Issues in Data Stream Systems
  3. Philippe Flajolet’s contribution to streaming algorithms : A presentation by Jérémie Lumbroso that visits some of the hostorical perspectives and how it all began with Flajolet
  4. Approximate Frequency Counts over Data Streams by Gurmeet Singh Manku & Rajeev Motwani : One of the early papers on the subject.
  5. [Methods for Finding Frequent Items in Data Streams](http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.187.9800&rep=rep1&t
@plentz
plentz / nginx.conf
Last active June 25, 2025 06:48
Best nginx configuration for improved security(and performance)
# to generate your dhparam.pem file, run in the terminal
openssl dhparam -out /etc/nginx/ssl/dhparam.pem 2048
@lost-theory
lost-theory / netstat-2015.md
Last active September 10, 2018 11:25
netstat on all machines -> python -> graphviz -> png
$ knife ssh -m "...every host in the network..." "sudo netstat -nutap" -a hostname > meganetstat.txt
$ python
>>> from collections import Counter as C
>>> HS = "...every host in the network...".split()
>>> ip = lambda s: s.split(":")[0]
>>> xs = [map(ip, [x[0], x[4], x[5]]) for x in [x.strip().split() for x in open("meganetstat.txt").readlines() if "tcp" in x] if len(x)>=6]
>>> ipmap = [(h, C([x[1] for x in xs if x[0] == h])) for h in HS]
>>> ipmapx = dict([(sorted([(x,y) for (x,y) in ip[1].items() if x.startswith("10.")], key=lambda t: -t[1])[0][0], ip[0]) for ip in ipmap])
>>> sorted(C(map(ipmapx.get, [x[2] for x in xs if x[2].startswith("10.")])).items(), key=lambda t: t[1])
@ashrithr
ashrithr / kafka.md
Last active March 14, 2024 21:16
kafka introduction

Introduction to Kafka

Kafka acts as a kind of write-ahead log (WAL) that records messages to a persistent store (disk) and allows subscribers to read and apply these changes to their own stores in a system appropriate time-frame.

Terminology:

  • Producers send messages to brokers
  • Consumers read messages from brokers
  • Messages are sent to a topic
@dustin
dustin / tcpproxy.go
Last active March 20, 2025 00:47
hex dumping tcp proxy
package main
import (
"encoding/hex"
"flag"
"io"
"io/ioutil"
"log"
"net"
"os"