05-13-2013
EXEC is used for below purpose
If command is supplied, it replaces the shell without creating a new process. If no command is specified, redirections may be used to affect the current shell environment.
If there are no redirection errors, the return status is zero; otherwise the return status is non-zero.
Hope it would help you to understand why they used exec in the script
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LEARN ABOUT DEBIAN
xsil2graphics
XSIL2GRAPHICS(1) User Contributed Perl Documentation XSIL2GRAPHICS(1)
NAME
xsil2graphics - generate scripts to load xsil output data files
SYNOPSIS
xsil2graphics [options] <xsil_file>
DESCRIPTION
Utility program bundled with xmds, used to generate scripts that load simulation output data into either matlab (http://www.mathworks.com)
or scilab (http://www.scilab.org), which are then used to manipulate the results further if necessary and then to present the results
graphically.
Matlab
To generate a matlab m-file, from the xsil file data_file.xsil use the command:
bash$ xsil2graphics data_file.xsil
or
bash$ xsil2graphics --matlab data_file.xsil
Then at the matlab command prompt:
>> data_file
Scilab
To generate a scilab script file, from the xsil file data_file.xsil use the command:
bash$ xsil2graphics --scilab data_file.xsil
Then at the scilab command prompt:
--> exec('data_file.sci')
OPTIONS
-m, --matlab generate matlab m-file script to load data from the xsil data file (the default option)
-s, -scilab generate scilab script file to load data from the xsil data file
-o, --outfile <out_file> specify an alternative output script filename to the default which is the input xsil filename with the .xsil
extension changed to either .m for the matlab m-file or .sci for the scilab script file
EXAMPLES
bash$ xsil2graphics nlse.xsil
Generates the output nlse.m to load the data into matlab
bash$ xsil2graphics -m nlse.xsil
Also generates the output nlse.m but explicitly sets matlab to be the output format
bash$ xsil2graphics --scilab nlse.xsil
Generates the output nlse.sci to load the data into scilab
bash$ xsil2graphics --outfile nlse_new.m nlse.xsil
Generates the output nlse_new.m to load the data into matlab
AUTHORS
Originally written by Greg Collecutt
Maintained by Paul Cochrane with code contributed by Joe Hope
BUGS
No known bugs.
SEE ALSO
xmds(1), loadxsil(1)
http://www.xmds.org
COPYRIGHT
Copyright (C) 2000-2004
Code contributed by Greg Collecutt, Joseph Hope and Paul Cochrane
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 MER-
CHANTABILITY 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; if not, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
perl v5.8.2 2004-06-21 XSIL2GRAPHICS(1)