How to clone an old hard drive to a new one by using Linux Terminal commands ?

I think in same device

#  cp  /olddevice  /newdevice

if another device

#  scp  /olddevice  /newdevice

I hope use SSH channel to be more secure

bsm alah alrahman alrahim

sudo dd if=/dev/X   of=/dev/Y  bs=512  conv=notrunk,noerror

where X is source hard disk  and Y is destination