Clear Screen

Clear Screen

[Ajay Jain]

Hi,

I use bash on Xterm.
While working you press Ctrl-L, so that the screen gets cleared and
you see the currently line only. But you may want to see the last
outputs/prints. However, if you do a Ctrl-L/clear command, these
prints go away. In that case, what can you use so that you clear the
screen of the prints/outputs from last command. But in case you want
to see the last output, you can just go scroll up/pageup.

I looked at the bash & Xterm manpage but this info is not available.

Thanks in Advance,
Ajay

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Re: Clear Screen

[Andy Koppe]

On 1 December 2010 11:34, Ajay Jain wrote:
> I use bash on Xterm.
> While working you press Ctrl-L, so that the screen gets cleared and
> you see the currently line only. But you may want to see the last
> outputs/prints. However, if you do a Ctrl-L/clear command, these
> prints go away. In that case, what can you use so that you clear the
> screen of the prints/outputs from last command. But in case you want
> to see the last output, you can just go scroll up/pageup.
>
> I looked at the bash & Xterm manpage but this info is not available.

Yep, looks like xterm doesn't push the screen content into the
scrollback when clearing the screen, and I can't see an option for it
either. You may want to try mintty, which does do what you expect (and
which doesn't require X).

Andy

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Re: Clear Screen

[Thomas Dickey]

On Wed, 1 Dec 2010, Ajay Jain wrote:

> Hi,
>
> I use bash on Xterm.
> While working you press Ctrl-L, so that the screen gets cleared and
> you see the currently line only. But you may want to see the last
> outputs/prints. However, if you do a Ctrl-L/clear command, these
> prints go away. In that case, what can you use so that you clear the
> screen of the prints/outputs from last command. But in case you want
> to see the last output, you can just go scroll up/pageup.
>
> I looked at the bash & Xterm manpage but this info is not available.

The closest I recall offhand is the xterm tiXtraScroll resource (which 
would be useful if you were asking about running vi, etc).  But a 
screen-clear is done without causing any scrolling action.

By the way, the clearing of the screen on ctrl/L is not done by xterm.
(PuTTY does this, in case you're mistaking it for xterm, otherwise
I'd assume bash is doing it).

-- 
Thomas E. Dickey
http://invisible-island.net
ftp://invisible-island.net

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Re: Clear Screen

[Andy Koppe]

On 1 December 2010 21:24, Thomas Dickey wrote:
> By the way, the clearing of the screen on ctrl/L is not done by xterm.
> (PuTTY does this, in case you're mistaking it for xterm, otherwise
> I'd assume bash is doing it).

Yep, bash sends '\e[2J' when ^L is pressed. PuTTY's behaviour of
interpreting ^L as formfeed is due to its SCOANSI mode being enabled
by default. (Strange that the VT100 interpreted ^L, which of course is
ASCII formfeed, as linefeed instead.)

Andy

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Re: Clear Screen

[Thomas Dickey]

On Wed, 1 Dec 2010, Andy Koppe wrote:

> On 1 December 2010 21:24, Thomas Dickey wrote:
>> By the way, the clearing of the screen on ctrl/L is not done by xterm.
>> (PuTTY does this, in case you're mistaking it for xterm, otherwise
>> I'd assume bash is doing it).
>
> Yep, bash sends '\e[2J' when ^L is pressed. PuTTY's behaviour of
> interpreting ^L as formfeed is due to its SCOANSI mode being enabled
> by default. (Strange that the VT100 interpreted ^L, which of course is
> ASCII formfeed, as linefeed instead.)

yes - it used to be that only printers did form-feeds, and terminals did 
not.  See my comment about a "repaginator" here:

http://invisible-island.net/personal/oldprogs.html

-- 
Thomas E. Dickey
http://invisible-island.net
ftp://invisible-island.net

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