Adding numbers, break on non-numbers...

Cruger · 03-22-2004, 09:04 AM

Hi agian...
2 biiiiiig problems on the same day.... maybe I should have stayed in bed this morning...
Anyways... trying to help a friend with a problem...

He's trying to write a script that adds numbers that are written in when executing the script...

What I've come up with this far is:
-----------------------------------------------------------------------------
#!/bin/bash
sum=0

for i in $*
do
sum=`expr $i + $sum`
done

echo "The sum of the numbers entered is $sum"
------------------------------------------------------------------------------

The only problem is that he want's it to break if a letter (character, non-numberic) is entered... how do I solve this?

jim mcnamara · 03-22-2004, 09:18 AM

Try:

Code:

for i in $*
do
okay=1
okay=`tr -s '[:alpha:]' '0'`
if [ $ok -eq 0 ] ; then
    break;
fi
sum=`expr $i + $sum`
done