osx user/group administration examples (chgrp)

From http://drupal.org/node/783808

2. Configure system requirements
================================

Next we'll create the aegir user and add it to the _www group. This part is
very different on Mac OS X than Linux or most other Unices. Must be a NeXTism.

Shell commands::
sudo dscl . -create /Users/aegir NFSHomeDirectory /var/aegir

Now you need to find the next spare UID to assign the user.

Here's how you find out on your system:

Shell commands::
sudo dsexport users.out /Local/Default dsRecTypeStandard:Users

Then open the file users.out in a text editor, search for the highest 5xx user
ID and add 1 to it (in your brain, not in the file). So if you find 506 but
no 507, use 507. When you're done, delete users.out to be safe.

Shell commands::
sudo rm users.out

Now assign this UID to the aegir user, replacing "5xx" with the UID.

Shell commands::
sudo dscl . -create /Users/aegir UniqueID 5xx

Set a secure password for the aegir user, as it needs shell access.

Shell Commands::
sudo passwd aegir

Create the aegir home directory and set its permissions.

Shell Commands::
sudo mkdir /var/aegir
sudo chown aegir /var/aegir
sudo chgrp _www /var/aegir

Add the aegir user to the _www group. This is the group Apache runs as.
sudo dscl . -append /Groups/_www GroupMembership aegir

Give the aegir user the ability to restart Apache.

Shell Commands::
sudo mv /usr/sbin/apachectl /usr/sbin/apachectl-apple
sudo ln -s /opt/local/apache2/bin/apachectl /usr/sbin/apachectl
sudo visudo

Go to the last line of the file and add the following:
aegir ALL=NOPASSWD: /usr/sbin/apachectl

Save the file and exit your text editor.

Next configure Apache to include the Aegir config.

Shell Commands::
echo "Include /var/aegir/config/apache.conf" >> /opt/local/apache2/conf/httpd.conf
/opt/local/apache2/bin/apachectl restart

Configuring your MySQL database and user accounts is the same as in the
INSTALL.txt file. But you probably want to add the path to its executables
to your user's PATH and the aegir user's PATH.

Shell Commands::
echo 'export PATH=/opt/local/lib/mysql5/bin:$PATH' >> ~/.profile
su - aegir
Password: (the password you setup earlier)
echo 'export PATH=/opt/local/lib/mysql5/bin:$PATH' >> ~/.profile
exit