Martin, thank you for the reply.
Does it support multiple modification lines at the same time? E.g.
# cat update.ldif
dn: cn=config,cn=ldbm database,cn=plugins,cn=config
changetype: modify
replace: nsslapd-db-locks
nsslapd-db-locks: 100000
replace: nsslapd-maxsasliosize
nsslapd-maxsasliosize: 10485760
replace: nsslapd-sasl-max-buffer-size
nsslapd-sasl-max-buffer-size: 10485760