TYPESCRIPT

cmd move all files to parent directory

 // navigate to the target folder,open cmd there and
 // execute mv * .. it will move all files to one level UP
>  mv * ..

move all files to parent directory

find . -maxdepth 1 -exec mv {} .. ;

this will move hidden files as well.
You will get the message:
mv: cannot move `.' to `../.': Device or resource busy