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src = [{foo: 1.2, bar: 2.3}, {foo: 3.2, bar: 3.0}]
src.each_with_object({foo: [], bar: []}) { |data, acc| acc[:foo] << data[:foo]; acc[:bar] << data[:bar] }
# => {:foo=>[1.2, 3.2], :bar=>[2.3, 3.0]}

[{foo: 1.2, bar: 2.3}, {foo: 3.2, bar: 3.0}].reduce { |a,b| a.merge(b) { |_,o,n| Array(o) << n } }
# => {:foo=>[1.2, 3.2], :bar=>[2.3, 3.0]}

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require 'sinatra/base'

class Application < Sinatra::Base
  get '/' do
    'Hello World!'
  end
end

run Application.run!

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If you recently tried to update a Debian-based box and during the upgrade got these two messages, among others:

insserv: Service mountkernfs has to be enabled to start service udev
update-rc.d: error: insserv rejected the script header

Then this is what will help you get the upgrade done:

1. Edit /etc/init.d/udev and remove mountkernfs from the line starting with Required-Start:, keep the rest of the line though

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My dream window manager

• every function accessible by mouse needs to be accessible by keyboard and vice-versa

• there are 1-n screens

  • each screen has 1-n workspaces, but the default is 12
  • workspaces do not span screens

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ruby -e 'puts "For breakfast: #{["scrambled eggs, grilled tomatoes and rye bread", "musli with oranges, raisins and warm milk", "rye bread with various spreads and cheeses"].sample}."'

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<?php
error_reporting(0);

# Install from https://github.com/michelf/php-markdown
require_once 'php-markdown/vendor/autoload.php';
use \Michelf\Markdown;

$text = file_get_contents($_SERVER['DOCUMENT_ROOT'] . $_SERVER['SCRIPT_NAME']);
$html = Markdown::defaultTransform($text);
?>

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#!/bin/bash
#
# Save as /usr/share/i3blocks/kb_layout, then use it by
# adding something like this to your i3blocks configuration:
#
# [kb_layout]
# interval=3

KB_LANG=$(setxkbmap -query | grep layout | cut -d ':' -f 2)
KB_LANG=${KB_LANG//[[:space:]]/}

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# Save as /etc/config/cake

# The interface to be limited
IF=eth0
# Kbps values
DNSPEED=100000
UPSPEED=7500
# Percentages
DNLIMIT=60 # ERLite3 can only manage 60Mbps
UPLIMIT=95

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#!/usr/bin/env Rscript
#
# Obacht! Interaktiver Modus und Skripte funktionieren in R teils verschieden
# voneinander. Interaktiv scan() = geskriptet readLines()! Oder man löst es wie
# unten zu sehen...

cat("\nBitte geben Sie eine positive ganze Zahl ein: ")
benutzereingabe = scan(file('stdin'), what = integer(), n = 1)
gausssche_summe = sum(1:benutzereingabe) # Wenn man Vektoren benutzen möchte.
                                         # Viel cooler ist Mathe:

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[...]

d-i preseed/late_command string \
echo -e "\n# The secondary network interface" >> /target/etc/network/interfaces; \
echo       "allow-hotplug eth1"               >> /target/etc/network/interfaces; \
echo       "iface eth1 inet dhcp"             >> /target/etc/network/interfaces
d-i preseed/late_command string echo -e "\n# The public network interface\nallow-hotplug eth2\niface eth2 inet static\n  address XXX\n  netmask XXX\n  gateway XXX" >> /target/etc/network/interfaces

d-i finish-install/keep-consoles boolean true
d-i finish-install/reboot_in_progress note