10-27-2009
No need to reimage.
To reverse the situation,
sudo defaults delete /Library/Preferences/com.apple.loginwindow Hide500Users
This will make the account visible in the Accounts preference pane unless you had added the HiddenUsersList dealie someone else suggested, in which case:
sudo defaults delete /Library/Preferences/com.apple.loginwindow HiddenUsersList
should do the trick.
Log in as a different admin (create one if necessary?) and control+click the previously hidden user icon in Accounts pref pane and change the user account ID, and/or home folder location.
If you change the uid, you will need to chown the home folder to the new uid by:
sudo chown <adminusername> /path/to/home/folder
If you changed the home folder location, you'll either move the old home folder to the new location, or allow the system to create a new home folder when you log in as the previously hidden admin user (if you created a second admin account that you no longer need, delete the second admin account through Accounts pref pane) and dispose of the old home folder.
I hope that's helpful. It can all be scripted also (though I doubt there would be much call for that).
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rmf(1mh) rmf(1mh)
Name
rmf - remove folder
Syntax
rmf [ +folder ] [ -help ] [ -[no]interactive ]
Description
The command removes all of the messages within the current folder, and then removes the folder itself. If there are any files within the
folder which are not part of MH, they are not removed, and an error message is displayed.
You can specify a folder other than the current folder by using the +folder argument. If you do not specify a folder, and cannot find the
current folder, asks you whether you want to delete instead.
If the current folder is removed, it makes current.
Note that the command irreversibly deletes messages that do not have other links, so use it with caution.
If the folder being removed is a sub-folder, the parent folder becomes the new current folder, and tells you that this has happened. This
provides an easy mechanism for selecting a set of messages, operating on the list, then removing the list and returning to the current
folder from which the list was extracted.
Using to delete a read-only folder deletes the private sequence and current message information from the file, without affecting the folder
itself. If you have sub-folders within a folder, you must delete all the sub-folders before you can delete the folder itself.
Options
-help Prints a list of the valid options to this command.
-interactive
-nointeractive
Asks for confirmation before deleting a folder. By default, deletes a folder and its messages without asking for confirmation.
If you specify the -interactive option, asks if you are sure before deleting the folder. You are advised to use this option,
since when deletes a folder its contents are lost irretrievably.
Examples
This example shows how asks for confirmation when the -interactive option is used:
% rmf -interactive +test
Remove folder "test"? y
Profile Components
Path: To determine the user's Mail directory
Files
The user profile.
See Also
rmm(1mh)
rmf(1mh)