topic Re: Evaluate operations in Operating System - HP-UX

Evaluate operations

ASSIST — Tue, 05 Nov 2002 12:18:58 GMT

I have an environment variable with an aritmetic operation very long

RES=4+5+6+76+.....

how i can evaluate this to obtain a result

I try to save this to a file

# echo $RES > op
# bc op

but don't work

thanks!

Re: Evaluate operations

John Palmer — Tue, 05 Nov 2002 12:25:51 GMT

If RES contains a valid integer arithmetic expression then you could evaluate it like this...

let X=${RES}

If RES contains any spaces then you'd have to change this to'''

let X="${RES}"

So
RES=4+5+6+76
let X=${RES}
print ${X}
91

Regards,
John

Re: Evaluate operations

john korterman — Tue, 05 Nov 2002 12:28:04 GMT

Hi,
in ksh you can try this:
# let RES="4+5+6+76+40"
# echo $RES
131

regards,
John K.

Re: Evaluate operations

James R. Ferguson — Tue, 05 Nov 2002 12:39:09 GMT

Hi:

# RES=4+5+6+76+10
# echo $RES | bc

Regards!

...JRF...