Check your typing again. The word "init" is not part of the command.$ ps -p 1 -o comm= init
Oops, I'm sorry. I think the word "init" is the response to the command! It should be!
Give the command as shown above, ending with comm= .... then hit Enter. It should respond with "init" (no quotes) on the next line below. Init is the SysV init system by default on MX-Linux.