[iamgopal]

By now, especially in linux, there should emerge an OS that is purely scripts to generate OS. Or is it already ?

[yjftsjthsd-h]

Depending on how you mean it, that exists variously in at least yocto, gentoo, or ALFS. Although I should point out this (visopsys) isn't Linux distro

[mehackernewsacc]

NixOS is what you are describing: https://nixos.org