Noob Shell Scripting

[DaveyMcK]

Hey guys I'm new but trying to figure something out, I'm teaching myself the basic's of Shell Scripting, and decided a Calculator of sorts is as good a place as any to start, However what I want to do is after each case statement to return you to the Original Question "Select Add...." is there a command to do this?

I would guess its a form of flagging the start point and referencing it in each case. Heres My code so far

echo "Select Add (+), Sub (-), Multi(x), Divide(/)"
read Opr

echo "First Number"
read Num1

echo "2nd Number"
read Num2

case $Opr in
+)
                Sum=`expr $Num1 + $Num2`
                echo "Answer = $Sum"
        ;;

-)
                Sum=`expr $Num1 - $Num2`
                echo "Answer = $Sum"
        ;;

/)
                Sum=`expr $Num1 / $Num2`
                echo "Answer = $Sum"
        ;;
x|X)
                Sum=`expr $Num1 \* $Num2`
                echo "Answer = $Sum"
        ;;
*)
                echo "Error, try again - Press anything to continue"
        ;;

esac

[hunter_thom]

Wrap the whole thing in a while loop, and break the loop if the user wants to exit.

something like:

while [ 1 ]; do
  echo "Continue?"
  read input
  if [ $input = "no" ]; then
    break
  fi
  # the rest of your calculator code
done

[DaveyMcK]

Wrap the whole thing in a while loop, and break the loop if the user wants to exit.

something like:

while [ 1 ]; do
  echo "Continue?"
  read input
  if [ $input = "no" ]; then
    break
  fi
  # the rest of your calculator code
done

Excellent Mate, I should be able to get it polished of from here.

[DaveyMcK]

Why is the goto command not considered proper coding? surely if it works its grand?

[elija]

goto is incredibly easy to abuse leading to unreadable and unmaintainable code which is a bad thing. Write your code as if the guy maintaining it after you it is a psycho with an axe and your address.

More info