[dns-operations] is there a diagnostic tool to obtain delegated ns?

[Stephane Bortzmeyer]

On Fri, Sep 12, 2014 at 12:13:00PM +1000,
 Mark Andrews <marka at isc.org> wrote 
 a message of 57 lines which said:

> The following will work for any zone w/o a embedded period in a
> label.

Loops endlessly for names like ssi.gouv.fr

>         parent=`expr "X$zone" : '^[^.]*.\(.*\)'`

Should it be parent=`expr "X$parent" : '^[^.]*.\(.*\)'` ?