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# searching through files content in current directory, not in .git subdir
find . -type f -not -path ".git" -exec grep --color -Hn "hello" {} \;

# VoIP
# reciever
nc -l -p 12345 | aplay
# sender
aplay | nc 192.168.0.2 12345

# view the file while it is still updating

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#!/usr/bin/env ruby
require 'bundler'

class CTagsService
  def call
    trap_int_signal
    system(command)
    system(['mv ', tmpfile, ' .git/tags'].join)
  end
  

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require 'rmagick'

module Captcha
  Image = Struct.new :text, :width, :height, :blur, :wave_length, :wave_amplitude do
    def image
      captcha_image = Magick::Image.new(width, height)
      captcha_text = Magick::Draw.new
      captcha_text.annotate(captcha_image, 0, 0, 0, height / 10, text) do
        self.gravity = Magick::CenterGravity
        self.pointsize = 60

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# openssl version
openssl version

# openssl commands
openssl list-standard-commands
# ca - create certificate authorities
# dgst - compute hash functions
# enc - encrypt/decrypt using secret key algorithms (it is possible to generate using a password or directly a secret key stored in a file)
# genrsa - generate a pair of public/private key for the RSA algorithm
# password - generation of “hashed passwords”

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module Breadcrumbs
  module InstanceMethods
    # Append a breadcrumb to the end of the trail
    def add_breadcrumb(name, url =  nil)
      @breadcrumbs ||= []
      url = send(url) if url.is_a?(Symbol)
      @breadcrumbs << [name, url]
    end
  end

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function ensure {
  if [[ $? -eq 0 ]]; then
    /usr/bin/osascript -e 'display notification "Zajebiście kurwa - działa!"'
    say 'Zajebiście kurwa - działa!'
  else
    /usr/bin/osascript -e 'display notification "Nosz kurwa - coś jebło!"'
    say 'Nosz kurwa - coś jebło!'
  fi
}

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(function() {
  // styles for console
  var greenStyle = 'font-weight: bold; color: green;';
  var redStyle = 'font-weight: bold; color: red;';
  var normalStyle = 'font-weight: none;';

  // customizable assertions
  var _assertions = {
    truth: function(obj) {
      if(obj != true) {

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FROM ruby:2.5.1-alpine3.7

RUN apk add --no-cache --update build-base linux-headers git postgresql-dev nodejs tzdata

ENV APP_PATH /www

RUN mkdir -p $APP_PATH
WORKDIR $APP_PATH

COPY Gemfile $APP_PATH/Gemfile

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###Setting up Pi Zero OTG - The quick way (No USB keyboard, mouse, HDMI monitor needed)
More details - http://blog.gbaman.info/?p=791

For this method, alongside your Pi Zero, MicroUSB cable and MicroSD card, only an additional computer is required, which can be running Windows (with Bonjour, iTunes or Quicktime installed), Mac OS or Linux (with Avahi Daemon installed, for example Ubuntu has it built in).
1. Flash Raspbian Jessie full or Raspbian Jessie Lite onto the SD card.
2. Once Raspbian is flashed, open up the boot partition (in Windows Explorer, Finder etc) and add to the bottom of the config.txt file dtoverlay=dwc2 on a new line, then save the file.
3. If using a recent release of Jessie (Dec 2016 onwards), then create a new file simply called ssh in the SD card as well. By default SSH is

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# yubikey-installer.nix
{ nixpkgs ? <nixpkgs>, system ? "x86_64-linux" } :

let
  config = { pkgs, ... }:
  with pkgs; {
    imports = [ <nixpkgs/nixos/modules/installer/cd-dvd/installation-cd-graphical-kde.nix> ];

    boot.kernelPackages = linuxPackages_latest;