addition to the documentation

[Cameron Simpson]

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.

Cheers,
Cameron Simpson <cs at zip.com.au>