A different way to deal with "unknown" user after upgrade from Tiger.

It's a known issue that doing upgrade and install or archive and install from Tiger to Leopard, produces a lot of folders with "unknown" group in their "get info" panel. This has to do with a different group structure in Tiger and Leopard.
In Tiger, every user has their own private group with the same name as the username. That group is set to be user's primary group.
In leopard, every new user with an account is a member of the group staff (gid=20) which is not present in Tiger. Leopard doesn't fully understand Tiger's private group structure, hence the "unknown" group. This causes various problems such as Finder crashes when trying to change the permissions and ownership in the get info window.
Apple's proposed way of dealing with this is described [here|http://docs.info.apple.com/article.html?artnum=307128].
However, this method doesn't change the existing group structure and doesn't resolve all the problems.
I'd like to suggest a different way of dealing with it.
1. create a new admin user (if you don't have one already), log out of your primary account and log into the new one.
2. enter the following in terminal:
*sudo dscl . delete /users/"username"*
where username is the short name of the user on the main account (not the one you are currently logged into).
This will delete that user.
3. Log out/in.
4. go to system preferences->accounts and create a new user with the name and short name exactly as the one you've deleted in step 2.
You'll be get a popup saying that a home directory by this name already exists and asking if you want to use it. Say "Yes".
That's it. Your main user will be recreated using the native group structure of Leopard with gid=20(staff). Permissions on your home directory will be reset with correct group and ownership.
I tested the process on my powerbook after an upgrade and install from Tiger to leopard and it worked without a hitch.
I like this method better than Apple's because it completely gets rid of Tiger's group structure which was creating all the confusion. The only downside as far as I can see is that you might have to manually change the group ownership on some files belonging to the main user that sit outside your home directory.
I would appreciate any comments on this.

hmm, I confess, I did this before installing 10.5.2 so i can't say for sure. However, I've dealt with a few people (see e.g. this [thread|http://discussions.apple.com/thread.jspa?messageID=7012957]) who are running 10.5.2 and still have this issue. I don't know what if anything 10.5.2 did about this but I'm quite sure that it didn't change the group structure inherited from Tiger.
Message was edited by: V.K.

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Never do yourself down Richard.
Leave that to other people.
It's quite common for smart developers to think they're not as good as they are.
I coach a fair bit and it's a surprisingly common feeling.
And to repeat.
Never use anything ends .. provider. They're for trivial demo apps. Transform xml into objects and use them. Write it back as xml. Preferably, use a database.
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http://1drv.ms/1IYxl3z
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http://social.technet.microsoft.com/wiki/contents/articles/30564.wpf-uneventful-mvvm.aspx
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I have a sample which involves no real data but is intended to illustrate some aspects of how viewmodels "do stuff" and how you use datatemplates to generate UI.
I can't remember if I recommended it previously to you:
https://gallery.technet.microsoft.com/WPF-Dialler-simulator-d782db17
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http://social.technet.microsoft.com/wiki/contents/articles/28209.wpf-entity-framework-mvvm-walk-through-1.aspx
The write up for step2 is work in progress.
https://gallery.technet.microsoft.com/WPF-Entity-Framework-MVVM-78cdc204
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Message was edited by: OttoGie

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A different way to deal with "unknown" user after upgrade from Tiger.

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