How to create Solution file with dotnet core CLI

I cannot find a way to create a new solution file using the dotnet core CLI commands described in https://learn.microsoft.com/en-us/dotnet/articles/core/tools/dotnet-sln.

I ran the commands:

• dotnet new web -n webtrain
• dotnet new classlib -n core

after that, the projects were created correctly, but now I want to create a solution file to group them all, but I cannot find the right command to do that. Anyone knows how to do that?

looks like you use

dotnet new sln --name mysolution

https://learn.microsoft.com/en-us/dotnet/articles/core/tools/dotnet-new