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Full Discussion: Reading a string and passing passing arguments to a while loop
Top Forums Shell Programming and Scripting Reading a string and passing passing arguments to a while loop Post 302590146 by goddevil on Saturday 14th of January 2012 10:49:51 AM
Old 01-14-2012
Quote:
Originally Posted by zaxxon
If I got it right, you can break it down altering IFS:
Code:
OLDIFS=$IFS
IFS=":"
 
while read A B C; do
   do someting here with $A or $B or $C
done < infile
 
IFS=$OLDIFS

Thank you Zaxxon.

I understand from your code what you're trying to read the i/p file in the while loop. I actually want to read the value of the variable i from the for loop.

When i try to make the while loop from $i , i am getting the following error :
Quote:
$i: ambiguous redirect
Any thoughts?

---------- Post updated at 03:49 PM ---------- Previous update was at 03:27 PM ----------

Is there any way that the value of the variable i be stored in a file or a variable that can be read by the while loop.

I have tried writing to a file and it does not work.

Code:
for i in $( cat rparam.cfg | tail +$RESPONSE | head -$RESPONSESTOP | grep -v "^#" | grep ':' )
 
echo $i
$i > .tempparam
while read x y z
do
<stuff>
done < tempparam
rm -f tempparam
done

 

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LEARN ABOUT OSF1

break

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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