How do I install CLI tools "under Rosetta 2" on MacBook M1?

Question

After getting a MacBook M1 2020 - I found most of my command line tools could no longer be installed. I presume this was because the tools were compiled to run on an Intel based chipset, and not the new Apple Chipset (citation needed).

Here is an example:

APP is not (yet) supported on ARM processors!
Rerun the APP installer under Rosetta 2.

How do I install an app "under Rosetta 2"?

Answer 1

I found the solution here, which worked a treat.

In Terminal, use

arch -x86_64 zsh

to start a shell under Rosetta 2

Addendum: I created a rosetta alias, so I can switch in the future:

echo 'alias rosetta="arch -x86_64 zsh"' >> ~/.zshrc

Answer 2

install rosetta and skip the license agreement

softwareupdate --install-rosetta --agree-to-license

Answer 3

I was intrigued to know more, and this is what I found:

What's the problem ?

Apple released the first Macs with Apple Silicon in November 2020. While most apps have been updated to run natively on Apple Silicon, there are still some that haven’t been updated yet. That’s where Rosetta 2 comes in.

Rosetta 2 is a translation layer for running Intel-based apps on Apple Silicon Macs. It uses dynamic binary translation to convert x86_64 code to the Arm64 architecture used by the M1 and M2 chips. It allows these new Macs to run apps that haven’t been updated to run natively on Apple Silicon.

source: howtogeek.com

What does arch -x86_64 zsh mean ? or do ?

arch is a command to use to display the machine architecture of the system. When used with -x86_64, it specifies that the following command should be executed as if the machine architecture is x86_64, which typically refers to a 64-bit Intel or AMD processor architecture.