when you update passwd/group/shadow

gistfile1.txt

for user in $(getent passwd | sort -t : -k 3 -n | cut -d : -f 1,3);do if [[ $(grep ${user%%:*} passwd | cut -d : -f 1,3) == ${user} ]];then echo $user is the same;else find / -xdev -user ${user%%:*} -print0 > change_owner/${user%%:*};fi ;done
for group in $(getent group | sort -t : -k 3 -n | cut -d : -f 1,3);do if [[ $(grep ${group%%:*} group | cut -d : -f 1,3) == ${group} ]];then echo $group is the same;else find / -xdev -group ${group%%:*} -print0 > change_group/${group%%:*};fi ;done
cd change_owner;for file in *;do cat $file | xargs -0 -I '{}' chown $file {};done;cd ..
cd change_group;for file in *;do cat $file | xargs -0 -I '{}' chgrp $file {};done;cd ..