How to redirect output with root privilegesEdit

$ echo foo | sudo tee $PATH_TO_FILE > /dev/null

Note that sudo echo foo > $PATH_TO_FILE won’t work, because only the echo subprocess runs as root; the shell that process the redirection continues to run as the unprivileged user.

Also, note that we still need to redirect the output from tee to /dev/null (because tee will not only write to the file, it will also output redundantly to the standard output).