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