How to install PowerShell core on MacOS

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NOTE: Original instructions are here, I have just duplicated here for easy access.
How to install
Do the following from the macOS console:
Install Homebrew. If you dont already have it, run this:
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/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
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Install Homebrew-Cask so future installations of software via brew is much nicer.
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brew tap caskroom/cask
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Now you can install PowerShell by running:
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brew cask install powershell
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You can be sure it is working by running:
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pwsh
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This should give you the powershell prompt and away you go!
How to upgrade
Run the following from the console:
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brew update
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brew cask upgrade powershell
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That should do it.
How to re-install
If for whatever reason you want to reinstall PowerShell use:
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brew cask reinstall powershell
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How to remove
If you are nuts and want to remove PowerShell from macOS run:
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brew cask uninstall powershell
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