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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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###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;

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dd if=/dev/zero of=/swap_file bs=1G count=16 # create a zero-filled 16GB swap file
fallocate -l 16G /swap_file # alternative, faster way
chmod 600 /swap_file # chmod
mkswap /swap_file # make swap partition on file
swapon /swap_file # apply swap file as a swap partition

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#!/usr/bin/env bash
set -eux

root="$(git rev-parse --show-toplevel)"
dir="$root/$(git rev-parse --git-dir)"

trap 'rm -f "$dir/$$.tags"' EXIT

hasktags -cxRf "$dir/$$.tags" "$root"

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""""""""""""""""""""""""""""""""" ESSENTIALS """""""""""""""""""""""""""""""""""
filetype plugin indent on                                                      " for plugins to load correctly
syntax enable                                                                  " turn on syntax highlighting
set nocompatible                                                               " don't try to be vi compatible

"""""""""""""""""""""""""""""""""" SETTINGS """"""""""""""""""""""""""""""""""""
" interface
set cmdheight=1                                                                " set command line height
set cursorline                                                                 " line at current cursor position
set foldcolumn=1                                                               " always show at least one cahr in fold column

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Work with TODO file

This gist presents a methodology of working on a task on feature branch using a TODO file as a support.

How?

Here is a possible scenario:

1. Turn on verbose commits option: git config --local commit.verbose true. It's really awesome!
2. Take a task from your project management tool.
3. cd to repo.
4. Checkout to a main branch on the repo: git checkout master.
5. Pull the most recent changes from origin: git pull origin master.