jeffreyiacono

#! /bin/sh
die() {
  echo $1
  exit 1
}

(
  flock -n 9 || die "couldn't acquire ze lock"
  echo "starting ..."
  sleep 10

jeffreyiacono

$ cat test.csv 
cat,dog,mouse
up,down,left,right
red,green,blue

$ cat test.csv | column -t -s,
cat  dog    mouse
up   down   left   right
red  green  blue

jeffreyiacono

module Enumerable
  def avg
    reduce(0.0, :+) / length
  end
end

jeffreyiacono

#!/bin/sh

# via: http://capotej.com/blog/2012/10/07/an-embedded-key-value-store-for-shell-scripts/

DBFILE=example.db

put(){
  echo "export kv_$1=$2" >> $DBFILE
}

jeffreyiacono

// tested in chrome
link = document.createElement("a")
// <a></a>
link.setAttribute("href", "https://whatever.com:3000/some-page?foo=bar#baz")
// undefined
link.href
// https://whatever.com:3000/some-page?foo=bar#baz
link.protocol
// https:
link.host

jeffreyiacono

DROP FUNCTION IF EXISTS shorten;

DELIMITER $$

CREATE FUNCTION shorten(s VARCHAR(255), n INT) RETURNS VARCHAR(255)
BEGIN
  IF ISNULL(s) THEN
    RETURN '';
  ELSEIF n < 15 THEN
    RETURN LEFT(s, n);

jeffreyiacono

# alternatively
class Dog
  def bark
    puts "bark bark"
  end
end

fido = Dog.new
rex  = Dog.new

jeffreyiacono

# round 1! => nonblocking example
[process a] $ flock -en sleeper.lock ./sleeper.sh
time to sleep ...
[process b] $ flock -en sleeper.lock ./sleeper.sh
# ^ will exit b/c of n switch: "Fail (with an exit code of 1) 
#   rather than wait if the lock cannot be immediately acquired.
... waking up # <= process a returning


# round 2! => blocking example

jeffreyiacono

#!/bin/sh

echo "you passed me $# args"
echo "pid = $$"
echo "and I am $0"

for a in $@
do
  echo $a
done

jeffreyiacono

require 'net/http'
require 'uri'
require 'io/console'

puts "Enter in a github username:"
gh_username = gets.chomp
puts "Enter in the github user password (hidden):"
gh_password = STDIN.noecho(&:gets).chomp

uri = URI.parse('https://api.github.com/user')