gmr

Note: These work for us with Cobbler 2.2.3 and Chef 11.4.0 on CentOS

Quick Install

These are our install steps on CentOS 6:

mkdir -p ~/.chef/plugins/knife/
curl -o ~/.chef/plugins/knife/set_environment.rb https://gist.github.com/gmr/5339326/raw/5bd498d25bc2f4d17f029cdc4a34ed38e461fec2/set_environment.rb
curl -o /usr/lib/python2.6/site-packages/cobbler/modules/install_pre_chef.py https://gist.github.com/gmr/5339326/raw/0b248a8b40e5bac5673bd7df7cfd60185af778bc/install_pre_chef.py

curl -o /usr/lib/python2.6/site-packages/cobbler/modules/delete_post_chef.py https://gist.github.com/gmr/5339326/raw/ae71362ae721c0391f0be2f4b2166f3806e90a91/delete_post_chef.py

scrogson

I recently started working at Blue Box and we use GitHub Enterprise (GHE) for all of our apps. I had gotten in the habit of using hub to improve my git workflow and was curious if I could use hub with GHE. I turned to the docs and sure enough, you can!

The docs tell you two ways of setting up hub to use GHE:

By default, hub will only work with repositories that have remotes which point to github.com. GitHub Enterprise hosts need to be whitelisted to configure hub to treat such remotes same as github.com:

$ git config --global --add hub.host my.git.org

brandonb927

#!/bin/sh

###
# SOME COMMANDS WILL NOT WORK ON macOS (Sierra or newer)
# For Sierra or newer, see https://github.com/mathiasbynens/dotfiles/blob/master/.macos
###

# Alot of these configs have been taken from the various places
# on the web, most from here
# https://github.com/mathiasbynens/dotfiles/blob/5b3c8418ed42d93af2e647dc9d122f25cc034871/.osx

MohamedAlaa

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

jboner

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

emanuelez

How Fast is Git?

The web is full of benchmarks showing the supernatural speed of Git even with very big repositories, but unfortunately they use the wrong variable. Size is not important, but the number of files in the repository really is!

Why is that? Well, that's because Git works in a very different way compared to Synergy. You don't have to checkout a file in order to edit it; Git will do that for you automatically. But at what price?

The price is that for every Git operation that requires to know which files changed (git status, git commmit, etc etc) an lstat() call will be executed for every single file

Wow! So how does that perform on a fairly large repository? Let's find out! For this example I will use an example project, which has 19384 files in 1326 folders.

vgrichina

[alias]
    stage = !sh -c '[[ -z "$@" ]] && git add -u || git add "$@" && git add -u "$@" ' -
    unstage = reset HEAD --
    rewind = ![[ -z "$@" ]] && git reset --hard HEAD || git checkout HEAD

Iristyle

# Windows AMIs don't have WinRM enabled by default -- this script will enable WinRM
# AND install the CloudInit.NET service, 7-zip, curl and .NET 4 if its missing.
# Then use the EC2 tools to create a new AMI from the result, and you have a system 
# that will execute user-data as a PowerShell script after the instance fires up!
# This has been tested on Windows 2008 R2 Core x64 and Windows 2008 SP2 x86 AMIs provided
# by Amazon
# 
# To run the script, open up a PowerShell prompt as admin
# PS> Set-ExecutionPolicy Unrestricted
# PS> icm $executioncontext.InvokeCommand.NewScriptBlock((New-Object Net.WebClient).DownloadString('https://raw.github.com/gist/1672426/Bootstrap-EC2-Windows-CloudInit.ps1'))

henrik242

#!/bin/bash

for arg; do [[ $arg = /* ]] || arg=$PWD/$arg; absargs+=("$arg"); done;
/Applications/P4Merge.app/Contents/Resources/launchp4merge "${absargs[@]}"

textarcana

#!/usr/bin/env bash

# Use this one-liner to produce a JSON literal from the Git log:

git log \
    --pretty=format:'{%n  "commit": "%H",%n  "author": "%aN <%aE>",%n  "date": "%ad",%n  "message": "%f"%n},' \
    $@ | \
    perl -pe 'BEGIN{print "["}; END{print "]\n"}' | \
    perl -pe 's/},]/}]/'