Windows Development • macOS Development • Android Development • Android Studio • Webserver Development • Linux Stuff • Sublime Text • GitHub Emotes

Info

Introduction

The living, breathing cheat-sheet!

Windows Development

• Open the Power Shell prompt

  • shortcut: Windows+X and type A

• Install Chocolatey the Package Manager

Run Get-ExecutionPolicy. If it returns Restricted, then run Set-ExecutionPolicy AllSigned or Set-ExecutionPolicy Bypass -Scope Process.

Set-ExecutionPolicy Bypass -Scope Process -Force; [System.Net.ServicePointManager]::SecurityProtocol = [System.Net.ServicePointManager]::SecurityProtocol -bor 3072; iex ((New-Object System.Net.WebClient).DownloadString('https://community.chocolatey.org/install.ps1'))

• Enable GPG signing with native Windows Git

foo@bar:~$ where gpg
C:\Program Files (x86)\GnuPG\bin\gpg.exe

foo@bar:~$ git config --global gpg.program "C:\Program Files (x86)\GnuPG\bin\gpg.exe"

macOS Development

• Open the Terminal Emulator

  • • shortcut: command+space and type terminal
  • command is also ⌘
  • option is also ⌥
  • control is also ⌃
  • shift is also ⇧

• View all (hidden) files in Finder

  • shift+command+.

• Go To Folder (open system directory in Finder)

  • shift+command+G

• Output log of all macOS downloaded content

sqlite3 ~/Library/Preferences/com.apple.LaunchServices.QuarantineEventsV* 'select LSQuarantineDataURLString from LSQuarantineEvent'

• Remove log of all macOS downloaded content

sqlite3 ~/Library/Preferences/com.apple.LaunchServices.QuarantineEventsV* 'delete from LSQuarantineEvent'

• Install Homebrew, the macOS package manager

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"

• Elevate to root

foo@bar:~$ sudo su
Password:🗝

• Copy contents of id_rsa.pub file to your clipboard

pbcopy < ~/.ssh/id_rsa.pub

• Display Time Machine Snapshots

tmutil listlocalsnapshots /

The terminal will display Snapshots like: com.apple.TimeMachine.2018-03-01-00201

• Delete Time Machine Snapshots

tmutil deletelocalsnapshots 2018-03-01-002010

Android Development

• Reboot Android device to bootloader

adb reboot bootloader

• Reboot Android device to fastboot (non-Samsung)

adb reboot fastboot

• Wipe Android device's User data (Cracked screen, need to wipe?)

adb fastboot -w

• OEM Unlock Android device bootloader

fastboot oem unlock

• Flash the bootloader partition with the file dragged into the console window

fastboot flash bootloder 

• Erase Dalvik cache

fastboot erase cache

• Reboot Android device (from Fastboot)

fastboot reboot

Android Studio

• Enable keyboard input without editing the config.ini:

Tools → Android → AVD Manager →✏️→ Show Advanced Settings (scroll to bottom) → Enable Keyboard Input

Webserver Development

• Install packages necessary to host webpages

sudo apt update && sudo apt install php apache2 libapache2-mod-php php-curl libapache2-mod-auth-mysql mysql-server php-mysql phpmyadmin

• Setup MySQL

mysql_secure_installation
mysql -u root -p

• Enable Apache2 rewrite module

a2enmod rewrite

• Enable headers rewrite module

a2enmod headers

• Enable mcrypt

sudo php5enmod mcrypt

• Restart Apache

sudo service apache2 restart

• Install Remote Sublime Text Binary

sudo wget -O /usr/local/bin/rmate https://raw.github.com/aurora/rmate/master/rmate && sudo chmod a+x /usr/local/bin/rmate

• Edit mysql config

rmate /etc/mysql/my.cnf

• Enable mysqli

rmate /etc/php/7.0/apache2/php.ini

• Make phpMyAdmin viewable

sudo ln -s /usr/share/phpmyadmin /var/www/html/phpmyadmin

• Edit Apache Configuration

rmate /etc/apache2/apache2.conf

• View Apache Error Log

rmate /var/log/apache2/error.log

• Update cURL

! /usr/bin/env bash

• Install any build-dependencies necessary for cURL

sudo apt-get build-dep curl

• Get latest libcurl (as of: Feb 25, 2016)

mkdir ~/curl
cd ~/curl
wget http://curl.haxx.se/download/curl-7.50.2.tar.bz2
tar -xvjf curl-7.50.2.tar.bz2
cd curl-7.50.2

In Review: Symbolic Link ln -s [current-target] [new-location]

• Update SSL (Avoid Heart Bleed)
  • First, ensure make is installed

sudo apt-get install make

• Download openSSL

wget https://www.openssl.org/source/openssl-1.1.0h.tar.gz

• Decompress and enter new directory

tar -xzvf openssl-1.1.0h.tar.gz
cd openssl-1.0.2g

• Configure openSSL

sudo ./config -Wl,--enable-new-dtags,-rpath,'$(LIBRPATH)'

• Compile openSSL

sudo make

• Install openSSL

sudo make install

• Restart

sudo reboot

• Verify openSSL version

openssl version -v

• Allow Access-Control to share Font cross-site
• Edit Apache2 Configuration:

<FilesMatch "\.(ttf|otf|eot|woff)$">
  <IfModule mod_headers.c>
    Header set Access-Control-Allow-Origin "*"
  </IfModule>
</FilesMatch>

• SSL Certificates with Let's Encrypt

  • First, add the repository:

  sudo add-apt-repository ppa:certbot/certbot

  • press enter to accept. Next, update the package and install

  sudo apt update && sudo apt install python-certbot-apache

  • Ensure apache2.conf contains port 80 entry for domain(s) being added
  • Generate SSL Certificate
    • certonly assumes you will manually configure SSL Certificate config

  certbot --apache certonly -d domain.com -d www.domain.com -d sub1.domain.com -d sub2.domain.com -d sub3.domain.com

  • Add to existing SSL Certificate
    • Ensure the original 'domain.com' is first in the list:

  certbot --apache certonly --expand -d domain.com -d www.domain.com -d sub1.domain.com -d sub2.domain.com -d sub3.domain.com -d sub4.domain.com

• Remove a Let's Encrypt SSL Certificate

rm -rf /etc/letsencrypt/archive/domain.com/
rm -rf /etc/letsencrypt/live/domain.com/
rm -rf /etc/letsencrypt/renewal/domain.com.conf

• Edit SSL Certificate configuration

rmate /etc/apache2/sites-available/000-default-le-ssl.conf

• Set up Auto-Renewal To run the renewal check daily, we will use cron, a standard system service for running periodic jobs. We tell cron what to do by opening and editing a file called a crontab

sudo crontab -e

Your text editor will open the default crontab which is a text file with some help text in it. Paste in the following line at the end of the file, then save and close it:

. . .
15 3 * * * /usr/bin/certbot renew --quiet

The 15 3 * * * part of this line means "run the following command at 3:15 am, every day". You may choose any time.

The renew command for Certbot will check all certificates installed on the system and update any that are set to expire in less than thirty days. --quiet tells Certbot not to output information nor wait for user input.

cron will now run this command daily. Because we installed our certificates using the --apache plugin, Apache will also be reloaded to ensure the new certificates are used.

Linux Stuff

• Print Working Directory

pwd

• Shortcuts

  • id username
    • List primary and secondary groups for username
  • ls ~
    • List contents of home directory

• User Administration

• Add a username and assign secondary group: tomcat7

sudo useradd -G tomcat7 -m username

• Recursively delete user and /home directory

sudo userdel -r username

• Assign primary group named primarygroup for user named username

sudo usermod -g primarygroup username

• Modify the secondary group(s) (comma,delimited,list) of username

sudo usermod -G admin,adm,merchant,issuer,username username

• Add a new group named groupname

sudo groupadd groupname

• To remove a user from a group, use the gpasswd command with the -d (short for delete) option as follows

gpasswd -d userName groupExiting

• Recursively change the owner of file directoryname to groupname

sudo chgrp -R groupname directoryname

• Change shell to bash (bash history) for username

sudo chsh -s /bin/bash username

• BASH Aliases

  • Create/Edit ~/.bash_aliases
  • Add:
    • alias rsub='rmate $1'
    • no whitespace around '='

• Modify file permissions with chmod a+x

chmod a+x ~/.bash_aliases

• To read and execute the contents of a file/script use the Source command (the following example loads the bash aliases file)

source ~/.bash_aliases

• Find all files owned by jacob, change owner to jason and group owner to groupname

sudo find .-user jacob -exec chown jason:groupname {} \;

Sublime Text

• Open .ssh/config in Sublime Text locally

subl ~/.ssh/config

• Enable remote Sublime Text editting, add

Host domain.com
RemoteForward 52698 127.0.0.1:52698

• Find all cron jobs listed by user
• exclude comments
• Suppress 'no crontab for user...' messages:

Must be run as root

for user in $(cut -f1 -d: /etc/passwd); do echo $user; crontab -u $user -l 2>/dev/null | grep -v '^#'; done

GitHub Custom Emotes

Use these emotes anywhere on GitHub (only)

emote	shortcode
	:bowtie:
	:neckbeard:
	:octocat:
	:shipit:
	:trollface:
	:suspect:
	:hurtrealbad:
	:feelsgood:
	:goberserk:
	:finnadie:
	:rage1:
	:rage1:
	:rage3:
	:rage4:
	:godmode:

Contributors