Trouble in getting user input while using CASE statement in UNIX Post: 302595280

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Top Forums Shell Programming and Scripting Trouble in getting user input while using CASE statement in UNIX Post 302595280 by gary_w on Thursday 2nd of February 2012 02:22:37 PM

02-02-2012

Registered User

New, improved version that clears the screen before displaying the menu:

Code:

#!/usr/dt/bin/dtksh

# set select construct prompts for each menu level.
typeset -r MAINPROMPT="Select a main option: "
typeset -r MANGOPROMPT="Select mango option: "

#  Loop main menu until user exits explicitly.
while :
do
   clear
  print "\nMenu Title Goes Here\n"
  PS3=$MAINPROMPT  # PS3 is the prompt for the select construct.

  select option in mango tango rango exit
  do
    case $REPLY in   # REPLY is set by the select construct,
                     # and is the number of the selection.
      1) # mango
         #  Loop mango menu until user exits explicitly.
         while :
         do
           clear
           print "\nmango sub-menu title\n"
           PS3=$MANGOPROMPT
           select option1 in add substract exit
           do
             case $REPLY in
               1) # add
                  print "\nYou picked [add]"
                  break  #  Breaks out of the select, back to the mango loop.
                  ;;
               2) # subtract
                  print "\nYou picked [subtract]"
                  break  #  Breaks out of the select, back to the mango loop.
                  ;;
               3) # exit
                  break 2  # Breaks out 2 levels, the select loop plus
                           # the mango while loop, back to the main loop.
                  ;;
               *) # always allow for the unexpected
                  print "\nUnknown mango operation [${REPLY}]"
                  break
                  ;;
             esac
           done
         sleep 2
         done
         break
         ;;
      2) # tango
         ;&  # Fall through to #3
      3) #rango
         print "\nYou picked $option"
         break
         ;;
      4) # exit
         break 2  #  Break out 2 levels, out of the select and the main loop.
         ;;
      *) # Always code for the unexpected.
         print "\nUnknown option [${REPLY}]"
         break
         ;;
    esac
  done
sleep 2
done

exit 0

gary_w

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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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