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Full Discussion: while loop problems
Top Forums Shell Programming and Scripting while loop problems Post 302194428 by Cameron on Tuesday 13th of May 2008 12:04:32 AM
Old 05-13-2008
It's easier to understand when you format your code so that's more manageable to work with and read ...
Code:
select action in "blabla" "blabla" "quit" 
do

  case $action in
    "blabla")  echo "I was passed blabla."
               echo "Now executing a command..."
               somecommandhere ;;  #.... for each possible command in $action
    "quit")    break ;;
    *)         print "this is not an option, try again" ;;
  esac

done

The select statement reads the values after 'in' ... "blabla" "blabla" "quit" .
Then selects each one in turn and passes the value to $action to use within the select statement.
$action is used in the case statement, here the value is compared to those listed values contained within the case statement and if a match is made, executes the code attached to that match. If the value of $action doesn't match any value contained within the case statement, then it is passed to (or rather picked-up by) the statements associated with '*'.

Hope that ruff explaination is of some benefit.

Cheers,
Cameron
 

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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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