Where is the admin's directory?

[Stephen Liu]

Hi all,

I'm following;

Red Hat Essex Preview
Lab Guide    
Red Hat Summit - 2012 Edition
http://fedorapeople.org/~russellb/openstack-lab-rhsummit-2012/

to set up OpenStack, Essex, on Fedora 17

I'm stuck here:
Now that an admin user has been created, that account can be used to administer keystone.
To make it easy to set the admin user's credentials in the proper environment
variables, create a keystonerc_admin file with the following contents ....
http://fedorapeople.org/~russellb/openstack-lab-rhsummit-2012/ch02s02.html

Where shall I create the file keystonerc_admin?  Where is the admin's directory?

Please help.  TIA

B.R.
SL