Re: [MLUG] clearing the screen without losing data

[Mike Miller <EMAIL:PROTECTED>]

On Sat, 3 May 2008, Robert Citek wrote:

> On Sat, May 3, 2008 at 1:27 AM, Mike Miller <EMAIL:PROTECTED> wrote:
> > in some terminals everything that was on the screen is deleted
> > and in others it is just scrolled up so that I can look at it if I want to.
>
> It appears to depend on your $TERM setting.  vt100 will erase.  For example:

What terminal were you using?  xterm?  In rxvt terminal, it does not work 
as you say -- it doesn't scroll with any TERM setting.  It doesn't work 
for me in xterm either.  Also, when I use PuTTY, I get the desired 
scrolling behavior even with vt100.

So I think your results (below) have something to do with the interaction 
of your terminal with your TERM setting.  The same tput clear string is 
giving me different results on different terminals.

Thanks for the tips on tput, od, etc.  That is very interesting.  Using 
that method I can see that rxvt and xterm TERM settings produce the same 
clear string.

Mike


> export TERM=vt100
> seq 1 100
> clear
>
> If you scroll back, you won't see the end of the sequence.  In
> contrast, xterm will scroll.  For example:
>
> export TERM=xterm
> seq 1 100
> clear
>
> I would venture the difference is because of the command sent to the terminal.
>
> $ ( TERM=vt100 ; tput clear | od -bcAn )
> 033 133 110 033 133 112
> 033   [   H 033   [   J
> $ ( TERM=xterm ; tput clear | od -bcAn )
> 033 133 110 033 133 062 112
> 033   [   H 033   [   2   J
>
> To view all the string command variations for clear:
>
> $ find /lib/terminfo/ -type f |
> while read name ; do
>  echo $name
>  TERM=${name##*/}
>  tput clear | od -bcAn
> done
>
> For more info, man tput and terminfo.
>
> Regards,
> - Robert

_______________________________________________
members mailing list
EMAIL:PROTECTED
http://mlug.missouri.edu/mailman/listinfo/members