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Full Discussion: Shell script debugging
Top Forums Shell Programming and Scripting Shell script debugging Post 302813513 by agama on Monday 27th of May 2013 01:12:30 PM
Old 05-27-2013
Yes, the "DISPLAY" command should execute and pipe it's output to grep. It would help if you could post the whole script, or at least the portions that include the assignment to the DISPLAY variable. It might also help to post the output.

Not knowing exactly what command has been assigned to DISPLAY, I can only guess, and my first thought is that the command's normal output is to standard error and not standard out. This situation could exhibit the behaviour you describe as grep might appear to execute first (failing because of an immediate end of file on standard input?) and the standard error from the command still appearing on the tty device.

Again, that is only a guess, and posting more of the script will certainly help people answer your question.
 

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LEARN ABOUT DEBIAN

lr_environment

LR_ENVIRONMENT.IN(1)					  LogReport's Lire Documentation				      LR_ENVIRONMENT.IN(1)

NAME

       lr_environment - Export Lire configuration in shell script form

SYNOPSIS

       eval `lr_environment`

DESCRIPTION

       The lr_environment command is used to import the Lire configuration in Lire shell scripts.

       All of Lire configuration variables will be written in a format that can be evaled by the shell.

       Shell scripts don't usually have to use that command, since it is done by the defaults file sourced by each command.

       The old names used by when the configuration was done in shell script are also exported by this script for backward compatibility.

AUTHOR

	 Francis J. Lacoste <flacoste@logreport.org>

VERSION

       $Id: lr_environment.in,v 1.12 2006/07/23 13:16:33 vanbaal Exp $

COPYRIGHT

       Copyright (C) 2003 Stichting LogReport Foundation LogReport@LogReport.org

       This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by
       the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

       This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

       You should have received a copy of the GNU General Public License along with this program (see COPYING); if not, check with
       http://www.gnu.org/copyleft/gpl.html.

Lire 2.1.1							    2006-07-23						      LR_ENVIRONMENT.IN(1)
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