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Re: Changing UID's?

On Fri, 2003-06-20 at 05:36, cr wrote:
> I'm 'cr', UID 1000 in my Debian setup.    However, under RedHat I was 
> UID 500 and all my heaps of data (left over from RedHat) is filed as  owner 
> 500  group 500.     This means I can't readily access it without changing 
> something.
> I could, of course,  chown  the whole lot to   cr:cr   (i.e.  1000:1000  in 
> this Debian system) but that means if I ever crash this installation and have 
> to put my RedHat disk back I'll have to change it all back again, so I'm a 
> little reluctant to do that  (and also, I'm nervous about changing ownerships 
> on entire directory trees....)
> For now, I've given myself access by adding a line in /etc/group   
> cr1::500:cr
> which as I understand it makes Debian think all the files with UID/GID of   
> 500:500  belong to a group 'cr1' and I, 'cr', am a member of that group.   
> (It doesn't work on any files copied from the old RH /home/cr/ which have 
> 'owner' permissions only, unless I su root or change permissions, but those 
> are just backups so I can live with that).
> However, it would be more sensible I think if I was User 500  in both 
> systems.   Is there any safe legal way to change my UID from 1000 to 500?
> Or, failing that, can I do it by using 'adduser' to create a new user, say 
> 'cr2', as user 500, then when I've got 'cr2' properly set up and everything 
> works, delete user 'cr' (with UID 1000) and rename user 'cr2' to 'cr'.   
> And, more importantly, are there any hidden snags in any of the above which 
> will crash my whole system or lock me out of it?

adduser can take an argument specifying uid
so you can 
deluser cr
and then
adduser cr --uid 500
in slackware you always get asked.


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