Using bc in bash script

[Dan Nelson]

In the last episode (Aug 14), Richard Tobin said:
> > I'm trying to calculate the number of seconds between $start_time and
> > $end_time in a bash script.
> 
> Bash has built-in integer arithmetic:
> 
>   et=$[End_time - Start_time]

Most bourne-based shells have arithmetic evaluation.  For portability,
you should use the $(( )) syntax:

/bin/sh
$ echo $(( 1 + 3 ))
4
$

-- 
	Dan Nelson
	dnelson at allantgroup.com