External resource:
http://www.inteller.net/notes/change-user-id-on-snow-leopard
Excerpts and more:
List all UIDs:
dscl . -list /Users UniqueID
Read the uid (given Alice as the user's name, 501 as old and 1234 as the new uid):
# dscl . -read /Users/Alice UniqueID
UniqueID: 501
Change uid:
# dscl . -change /Users/Alice UniqueID 501 1234
Change files ownership:
# find /Users/Alice -user 501 -print0 | xargs -0 chown -h 1234
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