The claim cannot be supported, nor can it be refuted. Based on your link for public facing servers [1] MS Windows has a Market share of ~22%, which Unix-like o

The claim cannot be supported, nor can it be refuted. Based on your link for public facing servers [1] MS Windows has a Market share of ~22%, which Unix-like operating systems have ~78%. [2] However, there are a lot of operating systems that make up that 78%. Breaking that down even further Linux based operating systems account for ~49% of that ~78% [3], which means Linux based operating systems have a ~38% total market share compared to Windows market share of ~22% And again, breaking that down even further Debian has the largest market share at ~35% of all Linux based operating systems. [4] Which means Debian has a total market share of ~13%. Substantially lower than your claim. In the context of this discussion you can't make the claim that all Linux based operating systems can be lumped together as they all have varying default shells and different versions of shells, so the portability of shell scripts comes into question. However, beyond this that's only publicly facing systems. There's no way to determine how many installs of each operating system there are in private networks. Long story short, it's a silly thing to debate. [1] https://en.wikipedia.org/wiki/Usage_share_of_operating_systems#Public_servers_on_the_Internet https://en.wikipedia.org/wiki/Usage_share_of_operating_syste... [2] https://w3techs.com/technologies/overview/operating_system https://w3techs.com/technologies/overview/operating_system [3] https://w3techs.com/technologies/details/os-unix https://w3techs.com/technologies/details/os-unix [4] https://w3techs.com/technologies/details/os-linux https://w3techs.com/technologies/details/os-linux