Delete file owned by root in dired mode

Question

I am trying to delete a file that is owned by root from Emacs dired opened as a regular user.

I get the following error:

(file-error Removing old name Permission denied /opt/file)

How can I execute this command with root privileges?

Answer 1

Use Tramp. Instead of running dired in /opt, run it in /sudo::/opt. This gives you root permissions.

Answer 2

Put the cursor on the line with the file and type: ! sudo rm