multiplication shows syntax error - UNIX for Dummies Questions & Answers

sonicstage · #1 04-07-2008

my shell script is simple arithmetic process.my addtion,substract and divide all can be worked only except multiplication.please help me.the shell is following:

Code:

#!/usr/bin/sh
echo "enter a number1:"
read number1
echo "enter an operator:"
read operator
echo "enter a number2:"
read number2
echo "result is:"
result='expr $number1 $operator $number2'
echo $result

vbe · #2 04-07-2008

What does * represent for the shell?

That should help you see what is going wrong...

vbe · #3 04-07-2008

Since you have posted very lately a few, that give me the feeling its close to homework if not...
I will just show you that modifying just a little your script I end with:

Code:

ra:/home/vbe $ calcul   
enter a number1:
34
enter an operator:
*
enter a number2:
2
result is:
68
ra:/home/vbe $

Look at my previous post and think hard...

kaushikraman · #4 08-07-2008

I get the strings concatenated if i use below:

temp=23
expr $temp*60

it gives me '23*60' as output instead of the actual multiplied value.
Could you please help me out?

kaushikraman · #5 08-07-2008

I got it now. Thanks anyways..

it must be expr[space]$variable[space]\*[space]60

thanks

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