How to handle numeric variables in sh?

[Scott Milliken]

Here's a code snippet of a script I use often to number a bunch of pics 
in a directory that I think shows how to do what you want to do:

$PICNUM=100
for FNAME in DSC*.JPG
do
   NEWNAME=My_Pictures-$PICNUM.jpg
   mv $FNAME $NEWNAME
   PICNUM=$(($PICNUM+1))
done

This works in /bin/sh from my FreeBSD 4.11 system and also bash.  If you 
want to perform a mathematical operation on a shell variable, just 
surround the expression with $(( expr )) and it'll work.

Hope that helps.

Scott Milliken

Alejandro Pulver wrote:

>Hello,
>
>Is there a way to handle numeric variables (addition, multiplication, etc.) in 'sh' (or throught an external command)?
>
>Thanks and Best Regards,
>Ale
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