Bourne shell question

[Chip Yamasaki]

In <1991May8.192623.24160 at bnlux1.bnl.gov> abrams at dan.ccd.bnl.gov (The Ancient Programmer) writes:

>	How does one do a simple computation in a shell script?
>The c-shell does it very neatly. 
>Running:
>	#!/bin/csh
>	set a = 10
>	set b = 1
>	@ c = $a - $b
>	echo "a=$a, b=$b, c=$c"

>produces: a=10, b=1, c=9

>but I've been unable to find out how to do this in the bourne shell.

You don't, exactly.  What you do is use the expr program.  It is slower
because it is external, but it works just fine.  Try

#!/bin/sh
a=10
b=1
c=`expr $a + $b`
echo "a=$a b=$b c=$c"
-- 
--
Charles "Chip" Yamasaki
chip at oshcomm.osha.gov