Hi,

I was just going through the online documentation 
<https://www.gnu.org/software/sed/manual/sed.html> for sed and I noticed 
that it describes the version 4.2.1 and not 4.2.2.
It does not include info about the -z option. Also adding a link to 
download the PDF in this page <https://www.gnu.org/software/sed/manual/> 
would be a good addition<https://www.gnu.org/software/sed/manual/>.

Regards,
Vineeth R.