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From: Hans Horn <hannes AT 2horns DOT com>
Subject: Re: Resizing a terminal window
Date: Fri, 07 May 2010 10:43:41 -0700
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David,

This took me forever to figure out!

'expect' does not forward SIGWINCH 
(http://en.wikipedia.org/wiki/SIGWINCH) unless told to do so.

Add the following snippet (between lines marked with 
###################) to the beginning of your 'expect' script:

#!/bin/sh
# \
exec expect -f "$0" ${1+"$@"}

###################
trap { # trap sigwinch and pass it to the child we spawned
   set rows [stty rows]
   set cols [stty columns]
   stty rows $rows columns $cols < $spawn_out(slave,name)
} WINCH
###################

set host [lindex $argv 0]
...

I use this to log on from cygwin to various AIX and LINUX machines.

Good luck and let me know how goes,
Hans

On 5/7/2010 10:09 AM, J. David Boyd wrote:
> Hans Horn<hannes AT 2horns DOT com>  writes:
>
>> On 5/5/2010 8:28 AM, J. David Boyd wrote:
>>> Thomas Wolff<towo AT towo DOT net>   writes:
>>>
>>>> Am 04.05.2010 16:03, schrieb J. David Boyd:
>>>>> ...
>>>>>
>>>>> Locally, I can use the mouse to resize a window, and the $COLUMNS and
>>>>> $LINES variables are automatically filled in.
>>>>>
>>>>> On many remote xterm sessions, they aren't.
>>>>>
>>>>> Does anyone have any idea where to start figuring out what is wrong, and
>>>>> what I can do to correct it?
>>>>>
>>>> LINES and COLUMNS are legacy mechanisms which may serve as a
>>>> workaround if the system doesn't otherwise handle screen size changes
>>>> properly. They should not be needed on modern systems where the tty
>>>> driver maintains the information.
>>>> (You may note that mintty has not set them initially but they get set
>>>> on resize - by whatever means... - while in a cygwin console they are
>>>> not used at all.)
>>>> So if you happen to have these variables set on a system which does
>>>> not maintain them, they don't get changed on resize and confuse your
>>>> environment. In most cases the best remedy is to just unset them -
>>>> does that help?
>>>>
>>>> ------
>>>> Thomas
>>>
>>> Sadly enough, the system I am connecting to, SUSE Linux, does use them,
>>> and the checkwinsize shopt BASH function, but, somehow, not
>>> correctly....
>>
>> Just for curiosity: are you using 'expect' to log to the remote system?
>> If so, you'd need you modify your expect script to handle SIGWINCH
>> properly. Let me know...
>> H.
>
> Yes I am.   I use expect to login, then go interactive.   There is a
> flag/setting to monitor SIGWINCH?
>
> Tell me, please!!!



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