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Full Discussion: Read multiple arguments in for loop each time
Top Forums Shell Programming and Scripting Read multiple arguments in for loop each time Post 302387320 by yuanli on Friday 15th of January 2010 08:38:36 AM
Old 01-15-2010
Read multiple arguments in for loop each time
Hi, Guys

I am new to shell programming and just get stuck with one simple question. please kindly help.

According to the tutorial here, we can do something like
Code:
   for NODE in "ABC 10" "EFG 20"
   do
      set -- $NODE
      echo "letter is $1, number is $2"
   done

And the result will be
Code:
   letter is ABC, number is 10
   letter is EFG, number is 20

But if I want to use a variable instead of hard-coded values like below, it doesn't work
Code:
   NODES='"ABC 10" "EFG 20"'
   for NODE in $NODES
   do
      set -- $NODE
      echo "letter is $1, number is $2"
   done

The result becomes
Code:
letter is "ABC, number is
letter is 10", number is
letter is "EFG, number is
letter is 20", number is

Can somebody please explain what is wrong here? and how to correct the error or point me to the right direction?
I am using Bourne Shell.

Many Thanks!
Last edited by pludi; 01-15-2010 at 09:55 AM..
 

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LEARN ABOUT MINIX

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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