ktkaushik

require 'pdf_generator'
class TasksController < ApplicationController
  include PdfGenerator
  def some_action
    pdf_generator( download = true )
  end
end

jboner

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

andreyvit

tmux cheat sheet

(C-x means ctrl+x, M-x means alt+x)

Prefix key

The default prefix is C-b. If you (or your muscle memory) prefer C-a, you need to add this to ~/.tmux.conf:

remap prefix to Control + a

rgreenjr

-- 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%' 

seratch

access_key_id: xxx
secret_access_key: yyy

flomotlik

#! /bin/bash

array=( $@ )
len=${#array[@]}
app=${array[$len-1]}
args=${array[@]:0:$len-1}

buffer_file=/tmp/last_heroku_run_`date +%N`

/usr/bin/heroku run "$args; echo \$?" --app $app 2>&1 | tee $buffer_file

faisalman

/**
* Convert From/To Binary/Decimal/Hexadecimal in JavaScript
* https://gist.github.com/faisalman
*
* Copyright 2012-2015, Faisalman <fyzlman@gmail.com>
* Licensed under The MIT License
* http://www.opensource.org/licenses/mit-license
*/

(function(){

abhishek77in

require "prawn"

Prawn::Document.generate("report.pdf") do

    10.times do
        start_new_page
    end

    repeat :all do
        move_down 50

wolfg1969

Raspberry Pi 4 + u-blox GPS module (uart)

$ sudo apt-get update
$ sudo apt-get install gpsd gpsd-client python-gps

Enable the serial interface and disable serial login shell with raspi-config then reboot. Confirm /dev/ttyS0 exists

$ ls -l /dev/serial*
lrwxrwxrwx 1 root root 5 May 9 10:38 /dev/serial0 -> ttyS0

proudlygeek

1. Install NFS on Server

Install the required packages (Ubuntu 12.04):

apt-get install nfs-kernel-server portmap

2. Share NFS Folder

Open the exports file:

vim /etc/exports