Date: Mon, 28 Nov 2016 00:30:01 +0100
From: Jakub Wilk <jwilk@jwilk.net>
To: Adam Borowski <kilobyte@angband.pl>
Cc: Andrey Utkin <andrey_utkin@fastmail.com>,
        Manuel =?utf-8?Q?Sch=C3=B6lling?= <manuel.schoelling@gmx.de>,
        plagnioj@jcrosoft.com, tomi.valkeinen@ti.com, jslaby@suse.cz,
        gregkh@linuxfoundation.org, linux-fbdev@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH v7 0/3] console: Add persistent scrollback buffers for
 all VGA consoles
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* Adam Borowski <kilobyte@angband.pl>, 2016-11-28, 00:15:
>>clear(1) doesn't wipe the scrollback at all, it is still reachable, all of 
>>it.
>
>It does for me on the console.  The man page says:
>
># clear clears your screen if this is possible, including its scrollback
># buffer (if the extended "E3" capability is defined).  clear looks in the
># environment for the terminal type and then in the terminfo database to
># determine how to clear the screen.
>
>Because of its reliance on terminfo, you need to have TERM=linux in your 
>environment; also, screen/tmux obviously breaks this.

The "linux" terminfo entry didn't have E3 until very recently.
You will need ncurses >= 20160514.

-- 
Jakub Wilk