Add new objectClass to existing ldap user

.sh

#! /bin/sh

ldapsearch -x -h localhost -b dc=example,dc=org,dc=uk                              \
        '(&(objectClass=existingObjectClass)(!(objectclass=newObjectClass)))' dn       \
        |awk '/^dn: / { print $2 }'                                             \
        | (
                while read line; do
                        printf 'dn: %s\nchangetype: modify\nadd: objectClass\nobjectClass: newObjectClass\n\n' "$line"
                done
        )                                                                       \
        | ldapmodify -Wxhlocalhost -Dcn=admin,dc=example,dc=org,dc=uk