linux-kernel - Re: [PATCH v7 0/3] console: Add persistent scrollback buffers for all VGA consoles

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Date:   Mon, 28 Nov 2016 00:30:01 +0100
From:   Jakub Wilk <jwilk@...lk.net>
To:     Adam Borowski <kilobyte@...band.pl>
Cc:     Andrey Utkin <andrey_utkin@...tmail.com>,
        Manuel Schölling <manuel.schoelling@....de>,
        plagnioj@...osoft.com, tomi.valkeinen@...com, jslaby@...e.cz,
        gregkh@...uxfoundation.org, linux-fbdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 0/3] console: Add persistent scrollback buffers for
 all VGA consoles

* Adam Borowski <kilobyte@...band.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