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Generate CSR

Provide SSL cert for that sub-domain, so we can apply to Bluemix.net and activate SSL (see attached example). Please notice that if the certificate need to be signed by external company, may take some time.

openssl req -new -sha256 -key ~/domain.com.ssl/domain.com.key -out ~/domain.com.ssl/domain.com.csr
openssl req -nodes -newkey rsa:2048 -keyout myserver.key -out server.csr

View certs

openssl x509 -in ssl_certificate.cer -text -noout

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How to get just several files/folders from another branch

git checkout master	# first get back to master
git checkout experiment doc/* app.js package.json	# then copy the version of files from branch "experiment"
git add . 
git commit -m "added something"

How to replace master branch in git, entirely, from another branch? [duplicate]

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Reference

Step 1 - Create a New SSH Key

We need to generate a unique SSH key for our second GitHub account.

ssh-keygen -t rsa -C "your-email-address"

Be careful that you don't over-write your existing key for your personal account. Instead, when prompted, save the file as id_rsa_COMPANY. In my case, I've saved the file to ~/.ssh/id_rsa_nettuts.

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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 "your_email@youremail.com"

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Syncing a fork MAC WINDOWS LINUX Sync a fork of a repository to keep it up-to-date with the upstream repository.

Before you can sync your fork with an upstream repository, you must configure a remote that points to the upstream repository in Git.

Open Terminal.

Change the current working directory to your local project.

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http://www.thegeekstuff.com/2010/02/unix-less-command-10-tips-for-effective-navigation

tail a moving file

less +F log/production.log

less +F works exactly like tail -f, with more:

• Simply press ctrl+c to switch to editing model, so you can scroll backward and using any more/vi command, such as /pattern to search
• Press shift+f again to switch back to tail model

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Simple Tricks to Improve the Terminal Appearance in Mac OS X

In .bash_profile:

export PS1="\[\033[36m\]\u\[\033[m\]@\[\033[32m\]\h:\[\033[33;1m\]\w\[\033[m\]\$ "
export CLICOLOR=1
export LSCOLORS=ExFxBxDxCxegedabagacad
alias ls='ls -GFh'
alias l='ls -laGFh'
alias ..='cd ..'

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Snippet to print out mem usage

logger.info(process.memoryUsage())

V8’s Memory Scheme

A running program is always represented through some space allocated in memory. This space is called Resident Set. V8 uses a scheme similar the Java Virtual Machine and divides the memory into segments:

• Code: the actual code being executed
• Stack: contains all value types (primitives like integer or Boolean) with pointers referencing objects on the heap and pointers defining the control flow of the program
• Heap: a memory segment dedicated to storing reference types like objects, strings and closures.`

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Project Title

One Paragraph of project description goes here

Getting Started

These instructions will get you a copy of the project up and running on your local machine for development and testing purposes. See deployment for notes on how to deploy the project on a live system.

Prerequisites

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Method 1

You can check using netstat -an that is there any process running on 8080 or not.

Method 2

On macOS High Sierra, use this command:

lsof -nP -i4TCP:$PORT | grep LISTEN

On older versions, use one of the following forms: