Weird linux problem: user is in www-data group in /etc/groups but groups command doesn't show him

I've come into something strange.

I just added a user to the www-data group, the user appears in both /etc/group and /etc/group-, however when I use the groups or id commands the group isn't listed; and the user can't chgrp a file into www-data.

What could be the problem? I'm using a Debian testing machine, never had this kind of problem.

Answer

Group membership is only processed on login. You can either:

re-login to pick up the new group

use newgrp www-data to run a new shell with gid set to www-data

Comments

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