The post-read request control has an OID of 1.3.6.1.1.13.2, and the value should be encoded in the same way as the AttributeSelection in a search Request. The response control has an OID of 1.3.6.1.1.13.2 (the same as the OID for the request control), and the value should be encoded in the same was as a SearchResultEntry.
The following Example shows the use of the post-read control in an ldapmodify request:
$ ldapmodify -h localhost -p 1389 -D "cn=directory manager" -w password \ --postReadAttributes=telephoneNumber dn: uid=aaltay,ou=People,dc=example,dc=com changetype: modify replace: telephoneNumber telephoneNumber: +1 995 589 3333 Processing MODIFY request for uid=aaltay,ou=People,dc=example,dc=com MODIFY operation successful for DN uid=aaltay,ou=People,dc=example,dc=com Target entry after the operation: dn: uid=aaltay,ou=People,dc=example,dc=com telephoneNumber: +1 995 589 3333