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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 HPUX

sh

sh(1)							      General Commands Manual							     sh(1)

NAME

       sh - overview of various system shells

SYNOPSIS

   POSIX Shell
       option] ...  string] [arg ...]

       option] ...  string] [arg ...]

   Korn Shell
       option] ...  string] [arg ...]

       option] ...  string] [arg ...]

   C Shell
       [command_file] [argument_list ...]

   Key Shell
DESCRIPTION

   Remarks
       The POSIX .2 standard requires that, on a POSIX-compliant system, executing the command activates the POSIX shell (located in file on HP-UX
       systems), and executing the command produces an on-line manual entry that displays the syntax of the POSIX shell command-line.

       However, the command has historically been associated with the conventional Bourne shell, which could confuse some users.   To  meet  stan-
       dards  requirements  and also clarify the relationships of the various shells and where they reside on the system, this entry provides com-
       mand-line syntax and a brief description of each shell, and lists the names of the manual entries where each shell is described in  greater
       detail.

       The Bourne shell is removed from the system starting with HP-UX 11i Version 1.5.  Please use the POSIX shell as an alternative.

   Shell Descriptions
       The HP-UX operating system supports the following shells:

	      POSIX-conforming command programming language and command interpreter
			residing  in  file Can execute commands read from a terminal or a file.  This shell conforms to current POSIX standards in
			effect at the time the HP-UX system release was introduced, and is similar to the Korn shell in many respects.	Similar in
			many  respects to the Korn shell, the POSIX shell contains a history mechanism, supports job control, and provides various
			other useful features.

	      Korn-shell command programming language and commands interpreter
			residing in file Can execute commands read from a terminal or a file.  This shell, like the POSIX shell, contains  a  his-
			tory mechanism, supports job control, and provides various other useful features.

	      A command language interpreter
			that incorporates a command history buffer, C-language-like syntax, and job control facilities.

	      Restricted version of the POSIX shell command interpreter.
			Sets  up  a  login  name  and  execution  environment whose capabilities are more controlled (restricted) than normal user
			shells.

	      restricted version of the Korn-shell command interpreter
			Sets up a login name and execution environment whose capabilities  are	more  controlled  (restricted)	than  normal  user
			shells.

	      An extension of the standard Korn Shell
			that uses hierarchical softkey menus and context-sensitive help.

							  +--------------+--------------------+
							  | To obtain:	 |  Use the command:  |
							  +--------------+--------------------+
							  | POSIX Shell  |  /usr/bin/sh ...   |
							  | Korn Shell	 |  /usr/bin/ksh ...  |
							  | C Shell	 |  /usr/bin/csh ...  |
							  | Key Shell	 |  /usr/bin/keysh    |
							  +--------------+--------------------+
       These shells can also be the default invocation, depending on the entry in the file.  See also chsh(1).

WARNINGS

       Many manual entries contain descriptions of shell behavior or describe program or application behavior similar to ``the shell'' with a ref-
       erence to ``see sh(1)''.

SEE ALSO

       For more information on the various individual shells, see:

       keysh(1)       Key Shell description.

       ksh(1)	      Korn Shell description.

       sh-posix(1)    POSIX Shell description.

       csh(1)	      C Shell description.

																	     sh(1)
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