03-29-2008
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Join Date: Feb 2002
Last Activity: 21 August 2019, 5:11 PM EDT
Location: Denmark
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hmm... give that, at the time you change the UID on the user (usermod -u 202 xyz) the UID on the files will no longer belongs to a valid user, this should allow you to use find with the -uid flag, in order to search for all the files owned by UID=200, this result you can parse through xargs demanding a chown xyz on the files, which in theory should provide you with the desired change on your system.
How ever, be aware the user in question should not be loged in on your system at the time of the change.