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Rsync delete orphan files from target only - no copy

Calling Rsync in the following way, using --existing, --ignore-existing and --delete enables the following:

• Only files at target that do not exist at source will be deleted.
• Skipping all file copy operations from source to target.

$ rsync -ri \
  --delete --existing --ignore-existing --progress \
  /path/to/source/ /path/to/target

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Ambari uses a local postgres db by default.This page describes how to use ambari-server with remote postgres server.

Install

Ambari is installed on centos 6.4 with the following command:

curl -so /etc/yum.repos.d/ambari.repo http://public-repo-1.hortonworks.com/ambari/centos6/1.x/GA/ambari.repo
yum repolist
yum -y install ambari-server

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Studying for a Tech Interview Sucks, so Here's a Cheat Sheet to Help

This list is meant to be a both a quick guide and reference for further research into these topics. It's basically a summary of that comp sci course you never took or forgot about, so there's no way it can cover everything in depth. It also will be available as a gist on Github for everyone to edit and add to.

Data Structure Basics

###Array ####Definition:

• Stores data elements based on an sequential, most commonly 0 based, index.
• Based on tuples from set theory.