file ownership

[lex1]

at the moment I have a file with this ownership
www-data www-data

it needs to be
www-data root

what is the command to change this?

lwx11

[indytim]

$ man chown

[ibuclaw]

Two commands you could use are chown or chgrp

chown lets you able to change both owner and group permissions

sudo chown www-data:root filename.txt

chgrp just allows you to change the group.

sudo chgrp root filename.txt

Since you are changing the group to a user that is not yourself, you are required to use sudo in order to acquire the right privileges to change the group permission of the file.

Regards
Iain