[CentOS] backups and md5 all in one while splitting

[Ruslan Sivak]

Ross S. W. Walker wrote:
>
> 'tee' splits the stdin into multiple output streams.
>
> The first instance of tee you listed gave it a file name and a pipe to 
> output the stdout to.
>
> The second instance did a redirection to a sub-shell which then passed 
> it to 'split' and it also had a pipe.
>
> -Ross
>

How does this sub-shell redirection work?  Can someone explain the 
syntax to me or shoot me a link to a doc somewhere? 

Russ