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content/articles/2023-09-22-introduction-to-programming-for-hvac-2.md

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+---
+tags: HVAC, programming, software
+title: "Introduction to Programming for HVAC Part-2"
+---
+
+# Introduction to Programming for HVAC Part-2
+
+In this article, learn about installing a package manager. If you missed it, check out the
+[first](https://mhoush.com/posts/introduction-to-programming-for-hvac-1/) article in the series where we learned about using your terminal.
+This article builds upon that foundation.
+
+## What is a Package Manager
+
+A package manager is a piece of software that helps to install software and manage updates for your system. For me, the first thing that I
+do with a new machine is install `Homebrew`. [Homebrew](https://brew.sh) is my preferred package manager for `macOS`.
+
+## Why
+
+A package manager is nice because often software relies / requires other dependencies in order to work properly. By using a package manager
+it will make sure that the correct dependencies are installed for the software that you need to run. It allows you to be able to update and
+manage software through a centralized interface.
+
+## Installation
+
+Installation is simple. Open up your terminal and enter the following command (easiest to just copy / paste from the homepage linked above).
+
+```bash
+/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
+```
+
+This will prompt you for your password in order to create some directories and install the required software for `brew` to work. The
+installation may take some time, while it downloads the command line tools for `Xcode`.
+
+When completed, follow the `Next Steps` and copy / paste the command listed, that should look like below.
+
+```bash
+(echo; echo 'eval "$(/opt/homebrew/bin/brew shellenv)"') >> /Users/<you>/.zprofile
+eval "$(/opt/homebrew/bin/brew shellenv)"
+```
+
+![brew-output](/articles/images/2023-09-22-brew-output.png)
+
+The first line of this command sets up some things in your shell profile (which we have not discussed yet) that will make `Homebrew`
+available to you anytime you start a new session in your terminal. The second line of the command makes it available in your current
+terminal session.
+
+Next run the following command and make sure that everything is setup correctly.
+
+```bash
+brew doctor
+```
+
+Which should output the following:
+
+```
+Your system is ready to brew.
+```
+
+### Terminology
+
+Homebrew calls command line applications `formula` and normal graphical applications `casks`. It has the ability to install both styles of
+applications.
+
+## Search Command
+
+The following command is used to search for software packages:
+
+```bash
+brew search chrome
+```
+
+## Open a Homepage
+
+The following command can be used to view the homepage of a formula or cask in your browser:
+
+```bash
+brew home google-chrome
+```
+
+## Update Homebrew
+
+The following command is used to update homebrew:
+
+```bash
+brew update
+```
+
+## Update packages installed on your system
+
+The following command is used to update software that is installed / managed by homebrew.
+
+```bash
+brew upgrade
+```
+
+You can combine the update and upgrade commands, which will update homebrew and upgrade all the software it manages on you machine with the
+following command.
+
+```bash
+brew update && brew upgrade
+```
+
+## Conclusion
+
+That is it for this article. I will say that for me, when I find a piece of software that I want to use, I generally try to search for it in
+`brew` first, before installing it via other means.
+
+I hope you've found this article helpful. In the next article we will start to use the skills that we've learned in these first two articles
+and write our first program / script.