addition to the documentation

[J]

On 17-01-29 08:43:26, J wrote:
> On 17-01-29 15:15:35, Cameron Simpson wrote:
> > On 28Jan2017 12:54, J <mailinglists at 927589452.de> wrote:
> > > wanted to add the following small explanation to the backup section:
> > > ZFS [...]
> > > #########
> > > #!/usr/bin/env bash
> > 
> > Please, just:
> > 
> >  #!/bin/sh
> > 
> > There's nothing there that needs bash, and _all_ UNIX systems have a
> > /bin/sh.  Portable.
> > 
> 
> I did just fix the header without looking at the real script part,
> but i tried changing to sh, and it breaks;
> it could probably be fixed with a rewrite of the case statements in
> sh-syntax
>
sed s/could/did/g
;)

will submit a pull request

Greets
J