# Install macOS

## Check Compatible macOS version
Use the following command to check macOS version
```
softwareupdate --list-full-installers
```

## Download macOS Installer
For example
```
softwareupdate --fetch-full-installer --full-installer-version 11.7.11
```

## Erase USB disk
Erase using Disk Utility. You can see the size of each OS with the --list-full-installers command before.


## Create Bootable USB Installer
Use the following command, change OS name and volume name based on your needs
```
sudo /Applications/Install\ macOS\ Ventura.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume
```

## Install

1. Shutdown your mac
1. Connect USB drive to your mac
1. Boot the mac into Startup Option screen:

For Apple Silicon Mac: Press and hold the power button on your Mac. As you continue to hold, your Mac starts up and loads startup options, which shows your bootable volumes, including the bootable installer.

For Other Mac: Turn on your Mac, then immediately press and hold the Option (Alt) key. Release the Option key when you see a screen showing your bootable volumes, including the bootable installer. 

1. Select "Options". Open Disk Utility. Erase the disk of your Mac
1. Go back. Choose "Install macOS xxx"


## Ref:
How to download and install macOS: https://support.apple.com/en-us/102662

Create a bootable installer for macOS: https://support.apple.com/en-us/101578