This stuff ends up sprayed everywhere, so let's create a reference document.

Homebrew

Homebrew

Install / Update

Using /usr/bin/ruby, installed as part of macOS

/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

installs to /usr/local/bin/brew

Check version

brew -v

Checks

brew doctor
brew missing

Path

Ensure /usr/local/bin is in your PATH

Commands

Update: brew update

Install

brew update
brew install <application-name>

Remove

brew update
brew remove <application-name>

List: brew list

Help: man brew

Search

brew search
brew search <string>

Installed

Homebrew installs stuff to the Cellar /usr/local/Cellar

MacDown - Markdown Editor

brew update
brew cask install macdown

To uninstall

brew cask uninstall macdown

Vim and MacVim

brew update

brew install vim && brew install macvim
brew linkapps macvim

Links MacVim to /Applications

Gradle

Gradle

brew update
brew install gradle

gradle -v

Gradle 2.11

Build time:   2016-02-08 07:59:16 UTC
Build number: none
Revision:     584db1c7c90bdd1de1d1c4c51271c665bfcba978
Groovy:       2.4.4
Ant:          Apache Ant(TM) version 1.9.3 compiled on December 23 2013
JVM:          1.8.0_45 (Oracle Corporation 25.45-b02)
OS:           Mac OS X 10.11.3 x86_64

Other

brew install wget

Install Tree

brew install tree
Install nmap
brew install nmap

macOS Upgrade to Sierra Problem

macOS Upgrade to Sierra broke brew update

To fix the problem

sudo chown $(whoami):admin /usr/local && sudo chown -R $(whoami):admin /usr/local