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@dergachev
dergachev / GIF-Screencast-OSX.md
Last active Sep 20, 2019
OS X Screencast to animated GIF
View GIF-Screencast-OSX.md

OS X Screencast to animated GIF

This gist shows how to create a GIF screencast using only free OS X tools: QuickTime, ffmpeg, and gifsicle.

Screencapture GIF

Instructions

To capture the video (filesize: 19MB), using the free "QuickTime Player" application:

View capybara cheat sheet
=Navigating=
visit('/projects')
visit(post_comments_path(post))
=Clicking links and buttons=
click_link('id-of-link')
click_link('Link Text')
click_button('Save')
click('Link Text') # Click either a link or a button
click('Button Value')
@pksunkara
pksunkara / .gitconfig
Last active Sep 20, 2019
Sample of git config file (Example .gitconfig)
View .gitconfig
[user]
name = Pavan Kumar Sunkara
email = pavan.sss1991@gmail.com
username = pksunkara
[core]
editor = vim
whitespace = fix,-indent-with-non-tab,trailing-space,cr-at-eol
excludesfile = ~/.gitignore
[sendemail]
smtpencryption = tls
@hellerbarde
hellerbarde / latency.markdown
Created May 31, 2012 — forked from jboner/latency.txt
Latency numbers every programmer should know
View latency.markdown

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs
Read 1 MB sequentially from memory ..... 250,000 ns  = 250 µs
@pkuczynski
pkuczynski / parse_yaml.sh
Last active Sep 19, 2019
Read YAML file from Bash script
View parse_yaml.sh
#!/bin/sh
parse_yaml() {
local prefix=$2
local s='[[:space:]]*' w='[a-zA-Z0-9_]*' fs=$(echo @|tr @ '\034')
sed -ne "s|^\($s\)\($w\)$s:$s\"\(.*\)\"$s\$|\1$fs\2$fs\3|p" \
-e "s|^\($s\)\($w\)$s:$s\(.*\)$s\$|\1$fs\2$fs\3|p" $1 |
awk -F$fs '{
indent = length($1)/2;
vname[indent] = $2;
for (i in vname) {if (i > indent) {delete vname[i]}}
@fnichol
fnichol / README.md
Last active Sep 18, 2019
Auto-enable Local HTTP Caching in Test Kitchen
View README.md

Auto-enable Local HTTP Caching in Test Kitchen

Note: total experiment and hack, looks nasty, could be awesome:

Setup

  • Drop the kitchen.local.yml into $HOME/.kitchen/config.yml
  • Install polipo (with Mac: brew install polipo, with Ubuntu: apt-get install polipo)
  • Drop polipo-start and polipo-console somewhere useful (perhaps $HOME/bin?)
@plepe
plepe / gist:52ecc9f18efb32c68d18
Last active Sep 18, 2019
MDADM and LVM cheat sheet
View gist:52ecc9f18efb32c68d18

mdadm

Glossary:

  • md: multiple devices
command description
cat /proc/mdstat show status of all raids
mdadm --detail /dev/md0 detailed status of raid md0
View windows-vm-openstack.md

Create a Windows OpenStack VM with VirtualBox

0. Obtain Windows ISO

  • Use an existing ISO or copy from a CD with dd if=/dev/cdrom of=image.iso

1. Boot VirtualBox VM from Windows ISO

  • Qcow disk type
  • 40GB Root Disk
  • Load your Windows ISO to the Primary CD drive
  • Add a secondary CD drive and attach the VirtIO ISO to it
@u0d7i
u0d7i / disable_vim_auto_visual_on_mouse.txt
Created Aug 8, 2015
Disable vim automatic visual mode on mouse select
View disable_vim_auto_visual_on_mouse.txt
Disable vim automatic visual mode on mouse select
issue: :set mouse-=a
add to ~/.vimrc: set mouse-=a
@marktheunissen
marktheunissen / pedantically_commented_playbook.yml
Created Jun 23, 2012 — forked from phred/pedantically_commented_playbook.yml
Insanely complete Ansible playbook, showing off all the options
View pedantically_commented_playbook.yml
---
# ^^^ YAML documents must begin with the document separator "---"
#
#### Example docblock, I like to put a descriptive comment at the top of my
#### playbooks.
#
# Overview: Playbook to bootstrap a new host for configuration management.
# Applies to: production
# Description:
# Ensures that a host is configured for management with Ansible.
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