Alan Cohen alandotcom

Multiple SSH Keys settings for different github account

create different public key

create different ssh key according the article Mac Set-Up Git

$ ssh-keygen -t rsa -C "[email protected]"

##Benchmark The benchmark module provides an easy way to time how long your Ruby code takes to run. In this example, I will use the bm method to generate sequential reports with labels.

This bit of code compares two different ways to concatenate strings. It times how long it takes to concatenate a period at the end of a string of 10,000 a's, one million times in a row. The label for the each test is passed into the report method.

require 'benchmark'

Benchmark.bm do |x|
 # Test for concatenation with +=

Opening and closing an SSH tunnel in a shell script the smart way

I recently had the following problem:

From an unattended shell script (called by Jenkins), run a command-line tool that accesses the MySQL database on another host.
That tool doesn't know that the database is on another host, plus the MySQL port on that host is firewalled and not accessible from other machines.

We didn't want to open the MySQL port to the network, but it's possible to SSH from the Jenkins machine to the MySQL machine. So, basically you would do something like

ssh -L 3306:localhost:3306 remotehost

Toggle MacOS X Notification Center on or off

This gist is to remind me (and anyone else who it helps) how to quickly disable and re-enable Notification Center.

Set Up Bash Aliases

Installation

Open your terminal (<⌘ + ␣ (spacebar)>, then type "terminal", then press <↩ (enter)>).

AWS CLI Cheatsheet

http://docs.aws.amazon.com/IAM/latest/UserGuide/best-practices.html https://www.youtube.com/watch?v=_wiGpBQGCjU

Setup

Docker - How to cleanup (unused) resources

Once in a while, you may need to cleanup resources (containers, volumes, images, networks) ...

delete volumes

// see: https://github.com/chadoe/docker-cleanup-volumes

$ docker volume rm $(docker volume ls -qf dangling=true)

$ docker volume ls -qf dangling=true | xargs -r docker volume rm

	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

	_ssh_auth_save() {
	ln -sf "$SSH_AUTH_SOCK" "$HOME/.ssh/ssh-auth-sock.$HOSTNAME"
	}
	alias screen='_ssh_auth_save ; export HOSTNAME=$(hostname) ; screen'
	alias tmux='_ssh_auth_save ; export HOSTNAME=$(hostname) ; tmux'

	user www-data;
	worker_processes 4;

	error_log /var/log/nginx/error.log;
	pid /var/run/nginx.pid;

	events {
	worker_connections 1024;
	}

	/**
	* Retrieves all the rows in the active spreadsheet that contain data and logs the
	* values for each row.
	* For more information on using the Spreadsheet API, see
	* https://developers.google.com/apps-script/service_spreadsheet
	*/
	function readRows() {
	var sheet = SpreadsheetApp.getActiveSheet();
	var rows = sheet.getDataRange();
	var numRows = rows.getNumRows();