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Full Discussion: Variable changes after a loop
Top Forums Shell Programming and Scripting Variable changes after a loop Post 302499532 by llelkes on Thursday 24th of February 2011 02:39:55 PM
Old 02-24-2011
Data Variable changes after a loop
Hi, I am a beginner with shell programming:
the code is following:

Code:
#!/usr/bin/ksh

v_res="start"
echo "v_res_begin="$v_res

grep -E "#FlatFiles" "a.log" | while IFS= read vLine
do

  set -- $vLine

  v_res="error"

  # there is some code ... if error then break


  echo "v_res_loop1="$v_res
  v_res="ok"
  echo "v_res_loop2="$v_res

done

echo "v_res_after_loop="$v_res


file a.log:
Code:
*************** Start of Group read and Group insert log ***************

#FlatFiles 10001 17487 test1.ctl test1.bad 12944
#FlatFiles 10001 17488 test1.ctl test1.bad 18119
#FlatFiles 10001 17489 test1.ctl test1.bad 11526

result:

Code:
v_res1=start
v_res2=ok
v_res1=error
v_res2=ok
v_res1=error
v_res2=ok
v_res_after_loop=error

This script was working on AIX, now it is on READHAT. I found out (google), that if pipe is used than it is in different scope and global parameters are not set ... but I do not undestand what does it really mean, and how can I fix the code.

Thank for Your help, regards,
Laci
Last edited by pludi; 02-24-2011 at 03:46 PM..
 

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LEARN ABOUT SUNOS

continue

break(1)							   User Commands							  break(1)

NAME

       break, continue - shell built-in functions to escape from or advance within a controlling while, for, foreach, or until	loop

SYNOPSIS

   sh
       break [n]

       continue [n]

   csh
       break

       continue

   ksh
       *break [n]

       *continue [n]

DESCRIPTION

   sh
       The break utility exits from the enclosing for or while loop, if any. If n is specified, break n levels.

       The continue utility resumes the next iteration of the enclosing for or while loop. If n is specified, resume at the n-th enclosing loop.

   csh
       The  break  utility  resumes  execution after the end of the nearest enclosing foreach or while loop. The remaining commands on the current
       line are executed. This allows multilevel breaks to be written as a list of break commands, all on one line.

       The continue utility continues execution of the next iteration of the nearest enclosing while or foreach loop.

   ksh
       The break utility exits from the enclosed for, while, until, or select loop, if any. If n is specified,	then  break  n	levels.  If  n	is
       greater than the number of enclosing loops, the outermost enclosing loop shall be exited.

       The  continue utility resumes the next iteration of the enclosed for, while, until, or select loop. If n is specified then resume at the n-
       th enclosed loop. If n is greater than the number of enclosing loops, the outermost enclosing loop shall be used.

       On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways:

       1.  Variable assignment lists preceding the command remain in effect when the command completes.

       2.  I/O redirections are processed after variable assignments.

       3.  Errors cause a script that contains them to abort.

       4.  Words that follow a command preceded by ** that are in the format of a variable assignment are expanded with the same rules as a  vari-
	   able  assignment.  This means that tilde substitution is performed after the = sign, and also that word splitting and file name genera-
	   tion are not performed.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       csh(1), exit(1), ksh(1), sh( 1), attributes(5)

SunOS 5.10							    17 Jul 2002 							  break(1)
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