Help me with correct command in (Terminal)
 

Respectful Members,

i am using a terminal as.............root@ubuntu

i want to copy a folder from..........user@ubuntu

on single same computer

You don't need to do it as a root login.

By default you should have either su and/or sudo available. So, open your terminal as the user,... escalate your authority to the root user, and issue a cp command from the start location to the destination location;

sudo cp /home/userdirectory/file.ext /root/

or;

su root
cp /home/userdirectory/file.ext /root/