darcyliu

#!/bin/bash
# Install Spark on CentOS 7
yum install java -y
java -version

yum install wget -y
wget http://downloads.typesafe.com/scala/2.11.7/scala-2.11.7.tgz
tar xvf scala-2.11.7.tgz
sudo mv scala-2.11.7 /usr/lib
sudo ln -s /usr/lib/scala-2.11.7 /usr/lib/scala

kennwhite

Howto: Install Alpine Linux 3.3 on VirtualBox OSX

• Latest Standard ISO version x86_64 is recommended (http://alpinelinux.org/downloads/)
• Create new VM ("Linux 2.6 / 3.x / 4.x (64-bit)")
• 1 CPU w/ 512BM RAM and 1 GB default (VDI) disk is more than sufficient
• Default networking (NAT)
• Boot and add Alpine ISO as attached virtual install media
• Default root password is blank (though note - ssh PermitRootLogin defaults to disallow blank passwords and: prohibit-password; switch to yes for Host ssh)
• Run setup-alpine
• Defaults are fine, but you do want "sys" disk setup to sda, y to confirm

kmassada

Libvirt

yum group install -y "Development Tools"
yum -y install qemu-kvm libvirt virt-install bridge-utils libvirt-devel  libxslt-devel libxml2-devel libvirt-devel libguestfs-tools-c

echo "net.ipv4.ip_forward = 1"|sudo tee /etc/sysctl.d/99-ipforward.conf
sysctl -p /etc/sysctl.d/99-ipforward.conf

gornostal

Python 2.7. Unicode Errors Simply Explained

I know I'm late with this article for about 5 years or so, but people are still using Python 2.x, so this subject is relevant I think.

Some facts first:

• Unicode is an international encoding standard for use with different languages and scripts
• In python-2.x, there are two types that deal with text.
  1. str is an 8-bit string.

2. unicode is for strings of unicode code points.

paulirish

What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.

Element APIs

Getting box metrics

• elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent

zchee

--- Actions ---
$Copy                                              <M-C>
$Cut                                               <M-X> <S-Del>
$Delete                                            <Del> <BS> <M-BS>
$LRU                                              
$Paste                                             <M-V>
$Redo                                              <M-S-Z> <A-S-BS>
$SearchWeb                                         <A-S-G>
$SelectAll                                         <M-A>
$Undo                                              <M-Z>

rsim

Get the current Unix timestamp (seconds from 1970-01-01T00:00:00Z) in SQL.

• MySQL: UNIX_TIMESTAMP()
• PostgreSQL: CAST(EXTRACT(epoch FROM NOW()) AS INT)
• MS SQL: DATEDIFF(s, '1970-01-01', GETUTCDATE())
• Oracle: (CAST(SYS_EXTRACT_UTC(SYSTIMESTAMP) AS DATE) - DATE'1970-01-01') * 86400

cyrilis

dir="."   #Set the default temp dir
tmpA1="$dir/spectrumhist_1_$$.png"
tmpB1="$dir/spectrumhist_1_$$.cache"
trap "rm -f $tmpA1 $tmpB1; exit 0" 0   #remove temp files
trap "rm -f $tmpA1 $tmpB1; exit 1" 1 2 3 15  #remove temp files
if [ $# -eq 2 ]
	then
	colors=$2
else
	colors=8

acgotaku

// ==UserScript==
// @name            百度网盘aria2导出工具
// @author          acgotaku311
// @description 一个方便吧百度网盘的Aria2rpc导出的脚本。
// @encoding           utf-8
// @include     http://*n.baidu.com/s/*
// @include     http://*n.baidu.com/disk/home*
// @include     http://*n.baidu.com/share/link*
// @include     https://*n.baidu.com/s/*
// @include     https://*n.baidu.com/disk/home*

staltz

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

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This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

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