Subject: Re: bug#36960: mistake with v param
From: Paul Eggert <[email-masked]>
To: Daniele Grassini <[email-masked]>
Cc: [email-masked]
Date: Thu, 2 Jan 2020 01:46:24 -0800
List-Id: <debbugs-submit.debbugs.gnu.org>

On 8/7/19 8:45 AM, Daniele Grassini wrote:
> so why the '-o' option check the regular exp, but the '-v' don't do his job??

The -v option was working as documented. It means, "select lines that *don't"
match the pattern", and since all input lines matched your pattern grep didn't
output anything.