When we don’t want to run a shell with sudo but still want to redirect output
to a location we don’t have permission to access we can use the
$ sudo cat /root/file | sudo tee /whatever/test.out > /dev/null
The redirect to
/dev/null is there to stop tee from outputting to the screen.
We have to use
tee because a normal redirection performed by the
shell is running with our users permissions.
This could be further simplified with:
$ sudo cat /root/file | sudo dd of=/whatever/test.out
dd is great to write large files (usually images to disks), but also works equally well with small ones.