Shell Programming and Scripting

First off just would like to say hello I'm new to this forum but it looks very interesting and I'm sure I will learn a lot from the various people here.

I'm new to UNIX and more so scripting in it. I have an assignment for a class that's mostly done online and my teacher is of no help whatsoever telling us he would review steps to do it and hasn't. My group including me is clueless on how to accomplish our task I could really use a hand. We are using Putty and writing the scripts using VI

1-
I need to write this particular script using the korn shell. It will take a number from the command line and perform the math in section 2(below). If no command line argument is given, the script should ask for a number between 1 and 20.

2-
The out of the script needs to be
a) The number
b) The square of the inputted number
c) The cube of the number
d) The square root of the number derived from (c)

So for example...It will ask
Please enter a number: "input 1-20"
You entered the number "XX"
The Square root of your number is "XXX"
The Cube of your number is "XXXXX"
The Qquare root of "XXXX" is "XX"

There's more kickers like if the number you enter isn't 1-20 it clears the screen and asks again for a number. Having an exit for a user other than entering a number. Using at least 1 sub function. Oye my head hurts just typing it.

Any help is seriously honestly appreciated.

Asking about homework is specifically prohibited by the rules of this forum.

However if you have actually done some work and are stuck on a particular point, post your code and we can point you in the right direction.

Code:

#!/bin/ksh
if [ $# -lt 1 ]
then
        echo "Please enter a number: input 1-20 \c"
        read Num
else
        Num=$1
fi
        echo "You entered the number " $Num
        Sqr=$(echo "$Num * $Num"  | bc -l)
        echo "The Square root of your number is " $Sqr
        Cub=$(echo "$Num * $Num * $Num"  | bc -l)
        echo "The Cube of your number is " $Cub
        result2=$(echo "sqrt($Cub)" | bc -l)
        echo "The Qquare root of " $Cub "is "$result2

hi,
u can try this code...hope this will work..

#set -x
#!/bin/ksh
echo "enter a number from 1-20 : \c"
read number
echo you entered number : $number.
echo "square of your number is : `expr $number \* $number`."
echo "cube of your number is : `expr $number \* $number \* $number`."
echo "sqrt($number)"|bc > square_root
echo "square root of your number is:`cat square_root`"
rm square_root
exit 0


-subhendu-

Oh man whoops way to make a first impression

I dont have access to putty where Im at right now but Ill put up an update here in a few hours

Sorry I completely missed that rule not trying to make a bad impression Annihilannic.

Subhendu- I tried out your script it looks to work, what is the \c for at the end of line 3? Also this is cool because it will do any number not just 1-20 but i need to clear the screen and re ask for a number if it isnt.

Im gonna try out Manos next and see what I come up with

Tried this syntax error at line 10 i couldnt figure it out