How to change encoding in Windows 10 command line?

Question

Character encoding

The bottom line is this, the teacher threw off the task with the attached .cmd file, which was supposed to create a Derby database for a java project, but instead of intelligible text there (on the command line) some kind of gibberish. Through simple operations, we determined that the encoding in the file is 1251 (Windows), and in our command lines the encoding is 866 (OEM). How to solve a similar problem?

Answer 1

We solved the problem ourselves, in a peculiar way
Opened PowerShell
entered chcp 1251
and worked through it