Is DOS still at the core of Windows 10?

Ever since XP, Windows is based on NT, not DOS.
But it still has a command line interface.
Just type “cmd” when you bring up the start menu.

Does “cmd” still work in Win 10?

Yes it does

Yes, as others have said.

However, it’s not your grandfather’s DOS. The old DOS has been rewritten a couple of times since the 1980s and, although the commands are pretty much the same, the functionality has been updated massively.

And just earlier this week, Microsoft announced a huge departure from the old CMD environment – in the next version of W10, they will be replacing CMD with Powershell as the command line interface. link

Windows 10 is great for command line computing. As well as “DOS” and PowerShell, they have added the Linux bash shell.

Now thats cool but I’m skeptical I’ll be able to remove cygwin anytime soon

I’ve been a Mac guy for decades, but I found this to be an interesting question with interesting comments. I learned DOS when I bought my first PC back in the dark ages—had to, no graphic interface then—and I think I could still use it if I had to. Thanks for the memories.