I'm running my CentOS server on my Xserver and what happen is that when I want to upgrade my Wordpress escpecially for now to Wordpress 3.3.2 the problem is that I got

Warning: copy(/wp-admin/includes/update-core.php) [function.copy]: failed to open stream: Permission denied in /wp-admin/includes/class-wp-filesystem-direct.php on line 200

And I understand that this is a permission problem.

Because the owner:group of my wordpress is under apache

So I wish to know how can I add myself to the same group of apache or even in the same group with root using command line? [Terminal]


I have password root to do any kind of command that require root password.

3 Answers 3


Try the following (if you're in sudoers list) or under root:

 sudo adduser <username> apache

If you're not familiar with sudo, here is a short guide:

  • 2
    it said command not found?
    – Ali
    Apr 21, 2012 at 12:10
  • 1
    If I have multiple users on my server with different websites, does adding the users to the apache group pose any security risk?
    – MrMoxy
    Apr 1, 2021 at 15:59

for an existing user

sudo /usr/sbin/usermod -a -G apache <username>

If the user exists already, use

sudo usermod -g <groupname> <user>

If it is a new user,

sudo useradd -g <groupname> <user>
  • 2
    use -a -G for secondary group. Otherwise it's the primary group
    – Jeremy
    Dec 1, 2014 at 16:54

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