Void: https://voidlinux.org/download/
Main download item (for bare metal) is ISO.
Debian: https://www.debian.org/distrib/
Main download item (for bare metal) is ISO (either netinst or full).
Ubuntu: https://ubuntu.com/download/desktop
Main download item (for bare metal) is ISO
RedHat: https://developers.redhat.com/products/rhel/download
Main download item (for bare metal) is ISO.
Slackware: http://www.slackware.com/getslack/
Main download item (for bare metal) is ISO
Windows: https://www.microsoft.com/en-au/softwar ... /windows11
Main download item (for bare metal) is ISO
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All of these have alternate installation methods (Void, for example, provides rootfs tarball), or cloud-ready installers. But __none__ them distributes a "script" for end-user bare-metal installation.
The closest thing to a script which I see is "Create Windows 11 Installation Media".
It's a 9.6 MB EXE download to create an installation media.
But in order to this to work, one must __already__ be running Windows.
But what is the format of installation media that it downloads?
An ISO.
The second closest thing to a script that I see is Debian "netinst".
But the netinst itself is distributed as .... guess what?
An ISO.
Make of it what you will.