"overriding" files in a linux command line is done by either copying or moving the source file to the target file.
So either
1)
Code:
mv /home/lukeskywalker/myfile /whereeveryouwantthefile/myfile
or
2)
Code:
cp /home/lukeskywalker/myfile /whereeveryouwantthefile/myfile
Option 1 would remove the source file whereas 2 would keep it.
EDIT: Looks like Esben beat me to it
- and yes Esbens Version is probably the easiest in this particular situation.