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building DataOS®

Devendra Singh devendrasr

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building DataOS®
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# Author: Pieter Noordhuis
# Description: Simple demo to showcase Redis PubSub with EventMachine
#
# Update 7 Oct 2010:
# - This example does *not* appear to work with Chrome >=6.0. Apparently,
# the WebSocket protocol implementation in the cramp gem does not work
# well with Chrome's (newer) WebSocket implementation.
#
# Requirements:
# - rubygems: eventmachine, thin, cramp, sinatra, yajl-ruby
@rgreenjr
rgreenjr / postgres_queries_and_commands.sql
Last active December 5, 2025 09:56
Useful PostgreSQL Queries and Commands
-- show running queries (pre 9.2)
SELECT procpid, age(clock_timestamp(), query_start), usename, current_query
FROM pg_stat_activity
WHERE current_query != '<IDLE>' AND current_query NOT ILIKE '%pg_stat_activity%'
ORDER BY query_start desc;
-- show running queries (9.2)
SELECT pid, age(clock_timestamp(), query_start), usename, query
FROM pg_stat_activity
WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%'
@facultymatt
facultymatt / roles_invesitgation.md
Last active April 16, 2024 09:31
Roles and permissions system for Nodejs
@yetithefoot
yetithefoot / stuns
Last active November 5, 2025 04:35 — forked from zziuni/stuns
STUN+TURN servers list
{url:'stun:stun01.sipphone.com'},
{url:'stun:stun.ekiga.net'},
{url:'stun:stun.fwdnet.net'},
{url:'stun:stun.ideasip.com'},
{url:'stun:stun.iptel.org'},
{url:'stun:stun.rixtelecom.se'},
{url:'stun:stun.schlund.de'},
{url:'stun:stun.l.google.com:19302'},
{url:'stun:stun1.l.google.com:19302'},
{url:'stun:stun2.l.google.com:19302'},
@Kartones
Kartones / postgres-cheatsheet.md
Last active December 9, 2025 11:10
PostgreSQL command line cheatsheet

PSQL

Magic words:

psql -U postgres

Some interesting flags (to see all, use -h or --help depending on your psql version):

  • -E: will describe the underlaying queries of the \ commands (cool for learning!)
  • -l: psql will list all databases and then exit (useful if the user you connect with doesn't has a default database, like at AWS RDS)
@xdamman
xdamman / install_ffmpeg_ubuntu.sh
Created July 2, 2014 21:03
Install latest ffmpeg on ubuntu 12.04 or 14.04
#!/bin/bash
# Bash script to install latest version of ffmpeg and its dependencies on Ubuntu 12.04 or 14.04
# Inspired from https://gist.github.com/faleev/3435377
# Remove any existing packages:
sudo apt-get -y remove ffmpeg x264 libav-tools libvpx-dev libx264-dev
# Get the dependencies (Ubuntu Server or headless users):
sudo apt-get update
@Ajido
Ajido / app.js
Created August 18, 2014 15:20
nodejs express4 cluster graceful restart / shutdown
...
app.use(function(req, res, next){
if (app.get('graceful_shutdown') === true) {
res.set('Connection', 'close');
}
next();
});
app.set('graceful_shutdown_start', function() {
@hassansin
hassansin / aspell-add-words.sh
Last active February 8, 2019 11:47
aspell add words to dictionary
touch ~/aspell.personal.txt
vi ~/aspell.personal.txt # add words per line
aspell --lang=en create master /tmp/en-personal.pws < ~/aspell.personal.txt
cp /tmp/en-personal.pws /usr/lib/aspell
vim /usr/lib/aspell/en_US.multi # add the line: 'add en-personal.pws'
@lolzballs
lolzballs / HelloWorld.java
Created March 22, 2015 00:21
Hello World Enterprise Edition
import java.io.FileDescriptor;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
public class HelloWorld{
private static HelloWorld instance;
public static void main(String[] args){
instantiateHelloWorldMainClassAndRun();
@transitive-bullshit
transitive-bullshit / logger.js
Last active July 9, 2024 04:09
winston logger with filename:linenumber
// NOTE: this adds a filename and line number to winston's output
// Example output: 'info (routes/index.js:34) GET 200 /index'
var winston = require('winston')
var path = require('path')
var PROJECT_ROOT = path.join(__dirname, '..')
var logger = new winston.logger({ ... })
// this allows winston to handle output from express' morgan middleware