Menu in Menu script issue Post: 302475286

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Top Forums Shell Programming and Scripting Menu in Menu script issue Post 302475286 by ctsgnb on Saturday 27th of November 2010 06:35:22 PM

11-27-2010

Registered User

You can lop in ==Calculator Program==

just the same way you loop in ==Option menu==

You can use break to get out of a while loop without exiting the entire script.

Use function when you do some tasks many times.

By the way, here is a sample of your code with some little improvment

Code:

case $option in

1)
compute(){
        echo $1
        echo "Enter first number" ; read a
        echo "Enter second number"; read b
        op=`expr $a "$SIGN" $b`
        [[ $op -ge 0 ]] && COLOR=$BLUE || COLOR=$RED
        echo -e Answer is: $COLOR"$op"$BLACK
}

while :
do
        echo ==Calculator Program==
        echo "1 - Addition"
        echo "2 - Subtraction"
        echo "3 - Multiplication"
        echo "4 - Division"
        echo "5 - Back to previous Menu"
        echo "6 - Exit"
        echo "Please enter your option"
        read option

        MSG="" ; SIGN=''
        case $option in
                1) MSG="==Addition==" ; SIGN='+' ; compute "$MSG" ;;
                2) MSG="==Subtraction==" ; SIGN='-' ; compute "$MSG" ;;
                3) MSG="==Multiplication==" ; SIGN='*' ; compute "$MSG" ;;
                4) MSG="==Division==" ; SIGN='/' ; compute "$MSG" ;;
                5) clear ; break ;;
                6) echo "Ok bye" ; exit 0 ;;
                *) echo "Enter valid option" ;;
        esac
done
;;

If we want to exit, there already is a choice in the menu, so .... the following lines are useless (and even bad for the workflow of query)

Code:

echo "Do you want to contine (Y/N)"
read opt;
echo $opt | grep -i 'y'
if [[ $? -eq 0 ]]
then
 clear
else
 exit 0
fi

Last edited by ctsgnb; 11-27-2010 at 09:02 PM..

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LEARN ABOUT OPENSOLARIS

noecho

echo(3XCURSES)						  X/Open Curses Library Functions					    echo(3XCURSES)

NAME

       echo, noecho - enable/disable terminal echo

SYNOPSIS

       cc [ flag... ] file... -I /usr/xpg4/include  -L	/usr/xpg4/lib 
	-R  /usr/xpg4/lib  -lcurses  [ library... ]

       c89 [ flag... ] file... -lcurses [ library... ]

       #include <curses.h>

       int echo(void);

       int noecho(void);

DESCRIPTION

       The  echo()  function enables Echo mode for the current screen. The noecho() function disables Echo mode for the current screen. Initially,
       curses software echo mode is enabled and hardware echo mode of the tty driver is disabled. The echo() and noecho() functions control  soft-
       ware echo only. Hardware echo must remain disabled for the duration of the application, else the behavior is undefined.

RETURN VALUES

       Upon successful completion, these functions return OK. Otherwise, they return ERR.

ERRORS

       No errors are defined.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Unsafe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       getch(3XCURSES), getstr(3XCURSES), initscr(3XCURSES), libcurses(3XCURSES), scanw(3XCURSES), attributes(5), standards(5)

SunOS 5.11							    5 Jun 2002							    echo(3XCURSES)