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Full Discussion: Problem using cut command in shell script
Top Forums Shell Programming and Scripting Problem using cut command in shell script Post 302420144 by joroca on Monday 10th of May 2010 06:53:06 PM
Old 05-10-2010
Problem using cut command in shell script
I'm new to shell programming, and am having a problem in a (Korn) shell program, which boils down to this:
The program reads a record from an input file and then uses a series of
"cut" commands to break the record into parts and assign the parts to
variables. There are no delimiters in the record. Here's a sequence of
three records from the input file:

S1830031HN106P
S1830032HN113XTA
S1830033MEI A

And here's the section of code that breaks the record into various parts,
with "InputLine" representing the record:

Code:
var1=`echo $InputLine | cut -c 1-5`
var2=`echo $InputLine | cut -c 1`
var3=`echo $InputLine | cut -c 2-5`
var4=`echo $InputLine | cut -c 6-8`
var5=`echo $InputLine | cut -c 9-13`

So the code should assign the characters in columns 9-13 to the var5
variable. The problem is that when the third record above ("S1830033MEI
A") is processed, the var5 should be assigned "MEI ", but ends up getting
assigned "MEI A". In the record, there are four spaces between the "I" and the "A", but the cut command seems to compress the consecutive whitespaces into one space, which then makes the "A" the fifth character in the variable. Is there a way to force the cut command to count each whitespace as a column, or some other simple way to assign exactly those characters in columns 9-13 to var5? I tried using various options with the cut command, but wasn't able to get the results I needed. I appreciate any help anyone can give.


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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
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       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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