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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 FREEBSD

atf-sh

ATF-SH(1)						    BSD General Commands Manual 						 ATF-SH(1)

NAME

     atf-sh [-s shell] -- interpreter for shell-based test programs

SYNOPSIS

     atf-sh script

DESCRIPTION

     atf-sh is an interpreter that runs the test program given in script after loading the atf-sh(3) library.

     atf-sh is not a real interpreter though: it is just a wrapper around the system-wide shell defined by ATF_SHELL.  atf-sh executes the inter-
     preter, loads the atf-sh(3) library and then runs the script.  You must consider atf-sh to be a POSIX shell by default and thus should not
     use any non-standard extensions.

     The following options are available:

     -s shell	  Specifies the shell to use instead of the value provided by ATF_SHELL.

ENVIRONMENT

     ATF_LIBEXECDIR    Overrides the builtin directory where atf-sh is located.  Should not be overridden other than for testing purposes.
     ATF_PKGDATADIR    Overrides the builtin directory where libatf-sh.subr is located.  Should not be overridden other than for testing purposes.
     ATF_SHELL	       Path to the system shell to be used in the generated scripts.  Scripts must not rely on this variable being set to select a
		       specific interpreter.

EXAMPLES

     Scripts using atf-sh(3) should start with:

	   #! /usr/bin/env atf-sh

     Alternatively, if you want to explicitly choose a shell interpreter, you cannot rely on env(1) to find atf-sh.  Instead, you have to hardcode
     the path to atf-sh in the script and then use the -s option afterwards as a single parameter:

	   #! /path/to/bin/atf-sh -s/bin/bash

ENVIRONMENT

     ATF_SHELL	  Path to the system shell to be used in the generated scripts.

SEE ALSO

     atf-sh(3)

BSD
								September 27, 2014							       BSD
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