I want to add the Apache user (www-data
) to the audio
group. I've read the man page for useradd
, but I'm not having any luck. I'm running xubuntu 11.10. Here's what I'm doing:
$ sudo useradd -G audio www-data
useradd: user 'www-data' already exists
If I leave out the -G
option, bash, prints the help info for useradd
:
$ sudo useradd audio www-data
Usage: useradd [options] LOGIN
Options: -b, --base-dir BASE_DIR base directory for the home directory...
It's not clear to me from the man page what options I should use to make this work.
Best Answer
The
useradd
command will try to add a new user. Since your user already exists this is not what you want.Instead: To modify an existing user, like adding that user to a new group, use the
usermod
command.Try this:
The
-a
(append) switch is essential. Otherwise, the user will be removed from any groups, not in the list.The
-G
switch takes a (comma-separated) list of additional groups to assign the user to.In general (for the GUI, or for already running processes, etc.), the user will need to log out and log back in to see their new group added. For the current shell session, you can use
newgrp
:newgrp
adds the group to the current shell session.