JoshCrosby

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.

JoshCrosby

Accessing your Virtualbox Guest from your Host OS

As a developer you want to ping and access the webserver on your virtual machine. This is a very simple solution to enable the bridge to the guest VM.

Requirements

• VirtualBox (latest version)
• A guest operation system (e.g. Ubuntu)

JoshCrosby

# 'Item*' it the pattern to look for
# sed "s/I/i/g" is the replacement pattern
for f in Item*; mv $f (echo {$f} | sed "s/I/i/g"); end

JoshCrosby

Useful Spacemacs commands

• SPC q q - quit
• SPC w / - split window vertically
• SPC w - - split window horizontally
• SPC 1 - switch to window 1
• SPC 2 - switch to window 2
• SPC w c - delete current window
• SPC TAB - switch to previous buffer
• SPC b b - switch buffers

JoshCrosby

bash_prompt_command() {
    local K="\[\033[0;30m\]"    # black
    local R="\[\033[0;31m\]"    # red
    local G="\[\033[0;32m\]"    # green
    local Y="\[\033[0;33m\]"    # yellow
    local B="\[\033[0;34m\]"    # blue
    local M="\[\033[0;35m\]"    # magenta
    local C="\[\033[0;36m\]"    # cyan
    local W="\[\033[0;37m\]"    # white
    local NONE="\[\033[0m\]"

JoshCrosby

Git Cheat Sheet

Basic commands

git init Creates a new git repository in the directory

git add <file name> Adds a specific file to staging

git add . or git add -A Adds the full directory and its contents to staging

JoshCrosby

Example: Moving up to a few commits to another branch

Branch A has commits (X,Y) that also need to be in Branch B. The cherry-pick operations should be done in the same chronological order that the commits appear in Branch A.

cherry-pick does support a range of commits, but if you have merge commits in that range, it gets really complicated

git checkout branch-B
git cherry-pick X
git cherry-pick Y

JoshCrosby

#!/bin/bash

# Disclaimer - make backups, use at your own risk.
#
# Based on this comment: http://stackoverflow.com/a/13944924/843067
# Views and stored procedures have to be done separately.

OLDDB="old_db_name"
NEWDB="new_db_name"
MYSQL="mysql -u root -pyour_password "

JoshCrosby

Kubectl output options

Let's look at some basic kubectl output options.

Our intention is to list nodes (with their AWS InstanceId) and Pods (sorted by node).

We can start with:

kubectl get no

JoshCrosby

from __future__ import unicode_literals
import logging
import json

logger = logging.getLogger(__name__)
logging.getLogger().setLevel(logging.INFO)


class PythonObjectEncoder(json.JSONEncoder):
    """Custom JSON Encoder that allows encoding of un-serializable objects