Give user superuser privileges

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http://serverfault.com – I'm trying to give a particular user superuser privileges, specifically the global write permissions that root hashe user in question must have these permissions without using sudo. It's a user that runs a service that is trying to write a file to a directory that it doesn't have write permissions on. I don't know what directory that is, or I would simply change the permissions on it as appropriate. I've tried following the instructions here without success: add new user with root access in Linux. The user in question is elasticsearch. I have the following lines in /etc/sudoers: root (HowTos)