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Full Discussion: Odd .sh behavior in script
Top Forums UNIX for Dummies Questions & Answers Odd .sh behavior in script Post 302165967 by otheus on Sunday 10th of February 2008 06:53:32 AM
Old 02-10-2008
Script problem
Yeah, you've called "process_interactive" recursively. When you get the "Are you sure prompt" and you enter "No", it calls process_interactive() again and eventually gets to the HTTP prompt for the first time. When that call returns/finishes, it continues at the prior execution point, which is to continue with the
Code:
while read; do

loop. When it finishes with that, it goes to the HTTP prompt for the second time. You can fix this with a double loop.
Code:
while true; do
   echo -n "Prompt for path: ";
   read path
   while true; do 
      echo -n "Are you sure? Y/N";
      read yesno
      if [ x$yesno == xY ]; then
        break 2;
      elif [ x$yesno == xN ]; then 
        continue 2;
      else
        continue;
      fi
  done
done

To see what I mean about the recursion, throw in a debugging statement at the top of the function call, like this:

Code:
echo >&2 "Entering function process_interactive"

If you are using ksh or bash, you can also turn on debugging. At the top of the script (or somewhere), do:
Code:
set -x

And you will get a line of output for each expression evaluated by the shell during the processing of the script.
 

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LEARN ABOUT ULTRIX

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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