From grass-lists-owner@max.cecer.army.mil Tue Aug 30 13:39:47 1994
From: sue@ced.berkeley.edu (Susan Huse)
Subject: redirecting stderr
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Date: Tue, 30 Aug 1994 11:47:59 -0700 (PDT)
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Content-Length: 900I am trying to write a tcltk script that finds the nearest site
and displays in a tk text widget stored text associated with the
site.I want to use d.where as coordinate input to the script, but I'm
having a difficult time redirecting the stderr. It seems that
have yout tried piping the output through sed?
stdout is just the coordinate pairs, which I want. The stderr
includes the mouse button instructions, etc. Tcltk chokes on
the stderr, thinking that in fact there has been an error.
some of the GRASS commands exit with a non zero status...
TCL picks this up as an error and directs the output into
an error message.
You may have to run this in a shellscript that sets the exit
status to zero when done.
How do I redirect stderr to /dev/null or somewhere else. It seems
that d.where (and d.what.rast) don't understand "2>".
I get a usage error statement telling that 2 is not a valid spheroid
parameter. I would be willing to use a pipe that directed only
stderr, but don't know how to do that. I don't want to use "|&"
because then I either lose my stdout or I get the button commands,
etc. mingled in with my coordinates.Sue Huse
REGIS
UC Berkeley
Keith Mitchell
University of Illinois
Dept. Of Ag. Engineering
Urbana, Illinois