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Full Discussion: How to selectively suppress perl output?
Top Forums Shell Programming and Scripting How to selectively suppress perl output? Post 302593912 by LessNux on Monday 30th of January 2012 12:12:56 AM
Old 01-30-2012
Question How to selectively suppress perl output?
The following perl statement in a bash script consists of two substatements. I intend the first perl substatement (the assignment with glob) to get input from the preceding bash pipe, and the second perl substatement (the foreach loop) to output back to bash. However, the first perl substatement undesirably outputs back to bash in addition to the desirable output from the second perl substatement. I want only the second perl substatement to output back to bash. Please show me how to prevent the first perl substatement from outputting to bash.

Code:
#!/bin/bash
set -f
vLn='bb cc dd'
echo $vLn | \
perl -pe 'my @vAry = glob; foreach my $i (@vAry) {print "$i\n";}'


The perl statement consists of
my @vAry = glob
and
foreach my $i (@vAry) {print "$i\n";}


The output from the first perl substatement is
bb cc dd

The output from the second perl substatement is
bb
cc
dd

I would like the entire perl statement to output the following.
bb
cc
dd

However, the actual output from the entire perl statement is
bb
cc
dd
bb cc dd

How can one suppress the output from the first perl substatement?

Many thanks in advance.


Update:

This question has been successfully answered by Post#8 by durden_tyler.
Last edited by LessNux; 01-30-2012 at 10:50 PM..
 

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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)
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