• Use the ldapmodify command from the command line. Specify the modification using the changetype:modify directive, and then specify which attributes are to be added using the add directive. In this example, we add another value for the cn attribute, which is multi-valued. When you are done typing, you can press CTRL-D (UNIX EOF escape sequence) twice to process the request.
    $ bin/ldapmodify -h server.example.com -p 389 -D "cn=admin,dc=example,dc=com" \
      -w password
    dn: uid=user.2004,ou=People,dc=example,dc=com 
    changetype: modify 
    add: cn 
    cn: Sally Tea Tree
    An error could occur if the attribute is single-valued, if the value already exists, if the value does not meet the proper syntax, or if the value does not meet the entry’s objectclass requirements. Also, make sure there are no trailing spaces after the attribute value.