Do not use test -a/-o.  Use shell features like &&, || or case...esac.
Use grep instead of egrep (but not the not-yet-portable Posix variant grep -E).
Based on a patch from Paul Eggert.

to "default", can be set to "accesslog" or "changelog". changelog is
not fully implemented yet.

only used for logging (c.f. accesslog overlay) the present phase is useless.

AttributeDescriptions must never be freed in a running slapd.