Xref: utzoo comp.unix.wizards:23408 comp.unix.questions:24587
Path: utzoo!utgpu!news-server.csri.toronto.edu!turing.toronto.edu!ruhtra
Newsgroups: comp.unix.wizards,comp.unix.questions
From: ruhtra@turing.toronto.edu (Arthur Tateishi)
Subject: Re: get terminal speed from shell script
Message-ID: <1990Aug13.005849.23223@jarvis.csri.toronto.edu>
Organization: CSRI, University of Toronto
References: <90Aug12.135618edt.18763@me.utoronto.ca>
Date: 13 Aug 90 04:58:49 GMT
Lines: 29

In artcle <90Aug12.135618edt.18763@me.utoronto.ca> sun@me.utoronto.ca (Andy Sun Anu-guest) writes:

>Is there a way to get the terminal speed from a (sh or csh) script?
>I used to be able to do the following in a Bourne shell script:
>			speed=`stty speed`
>and got the terminal speed assigned to variable speed. As various OS
>gets updated (e.g. Ultrix 3.1 and SUN OS 4.0.3), this won't work anymore
>because all stty outputs are being sent to stderr, not stdout, thus no
>piping or redirection is possible. Is there any similar commands that can 
>get terminal speed inside a shell script?

I find it odd that the SUN man pages still specify option info is output
on stdout...  Maybe I shouldn't be surprised.

However, I since stty seems to go bonkers when stdout goes to something
other than a proper tty device, I came up with the following.
		speed=`stty speed 3>&2 2>&1 1>&3` 
This essentially swaps stdout and stderr with a dangling file descriptor 3
which could be closed with 3>&- however it shouldn't matter. Be warned,
if stderr has been modified to be a socket going somewhere, it will likely
blow up with 'stty: Operation not supported on socket.' so you could use
		speed=`stty speed 2>&1 1>/dev/tty` 
which also has its drawbacks. 
Sorry, I can't confirm this for Ultrix. 

-- 
``Sex and drugs? They're nothing compared with a good proof!''
                                - A Cambridge student  (r.h.f)
Arthur Tateishi                 g9ruhtra@zero.cdf.utoronto.edu