Changing UID and GID on Mac OS X Leopard
$ id
uid=501(yongsun) gid=501(yongsun) groups=501(yongsun),98(_lpadmin),81(_appserveradm),79(_appserverusr),80(admin)
$ sudo dscl . -change /Users/yongsun UniqueID 501 1000
$ sudo dscl . -change /Users/yongsun PrimaryGroupID 501 1000
$ sudo dscl . -change /Groups/yongsun PrimaryGroupID 501 1000
$ id
uid=1000(yongsun) gid=1000(yongsun) groups=1000(yongsun),98(_lpadmin),81(_appserveradm),79(_appserverusr),80(admin)
$ chown -R yongsun:yongsun /Users/yongsun
