ikuz

Nix notes

Nix concepts

packages (and derivations)

• package: a software package
• derivation: a specific version of a software package
  • identified by a hash

alissonsales

awk '{ print "*" NF "\r"; for(i = 1; i <= NF; i++) { print "$" length($i) "\r\n" $i "\r" } }'

lrascao

sudo yum install gcc gcc-c++ make libxslt fop ncurses-devel openssl-devel *openjdk-devel unixODBC unixODBC-devel

KERL_CONFIGURE_OPTIONS="--with-ssl=/home/ec2-user/openssl/releases/1.0.2h --disable-dynamic-ssl-lib" kerl build 18.3 18.3

# without ECC
KERL_CONFIGURE_OPTIONS="CFLAGS=-DOPENSSL_NO_EC=1" kerl build 18.3 18.3

crcastle

Assumed conditions:

• Apache Kafka on Heroku cluster provisioned
• Topic has been created named cli-test (but you can change the name used below)
• Heroku CLI
• Heroku CLI Kafka plugin
• Homebrew, sed

Install C/C++ Kafka Library (librdkafka) and Kafka CLI tool (kafkacat)

For OS X, use the Homebrew command below. For others, see installation instructions at the links above.

josevalim

# You will need fswatch installed (available in homebrew and friends)
# The command below will run tests and wait until fswatch writes something.
# The --stale flag will only run stale entries, it requires Elixir v1.3.
fswatch lib/ test/ | mix test --stale --listen-on-stdin

tam7t

Are your Ruby HTTPS API calls secure?

Let's check:

2.0.0-p481 :001 > OpenSSL::SSL::SSLContext::DEFAULT_PARAMS
 => {:ssl_version=>"SSLv23", :verify_mode=>1, :ciphers=>"ALL:!ADH:!EXPORT:!SSLv2:RC4+RSA:+HIGH:+MEDIUM:+LOW", :options=>-2147482625}
2.0.0-p481 :002 > rating = JSON.parse(RestClient::Resource.new("https://www.howsmyssl.com/a/check" ).get)['rating']
 => "Bad"

darrencauthon

apt-get -y install build-essential m4 libncurses5-dev libssh-dev unixodbc-dev libgmp3-dev libwxgtk2.8-dev libglu1-mesa-dev fop xsltproc default-jdk
apt-get -y install make
apt-get -y install libncurses5-dev
mkdir -p /src/erlang
cd /src/erlang
wget http://www.erlang.org/download/otp_src_17.0.tar.gz
tar -xvzf otp_src_17.0.tar.gz
chmod -R 777 otp_src_17.0
cd otp_src_17.0
./configure

edgurgel

require "formula"

# https://github.com/Homebrew/homebrew/blob/master/Library/Formula/elixir.rb
class ErlangInstalled < Requirement
  fatal true
  default_formula 'erlang'
  env :userpaths

  satisfy {
    erl = which('erl') and begin

d0rc

iex(2)> Test.test1
{1474377, :ok}
iex(3)> Test.test2
{755840, :ok}

joice

module FlashMessagesHelper
  def flash_messages
    safe_buffer do |html|
      filtered_flash_messages.each do |name, message|
        html << content_tag(:div, content_tag(:p, message), :class => "message #{name}")
      end
    end
  end

  private