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Date: Sun, 7 Feb 1999 21:39:57 +0000
From: Ben Smithurst <ben@scientia.demon.co.uk>
To: root@isis.dynip.com
Cc: freebsd-questions@FreeBSD.ORG
Subject: Re: Help About Shell Script
Message-ID: <19990207213957.A1306@scientia.demon.co.uk>
References: <19990207133723.B71725@scientia.demon.co.uk> <199902071818.VAA63085@isis.dynip.com>
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root@isis.dynip.com wrote:

> On  7 Feb, Ben Smithurst wrote:
>
> > i=0
> > while [ $i -le 1000 ]; do
> > 	j=0
> > 	while [ $j -le 1000 ]; do
> > 		## do your stuff here with $i and $j
> > 
> > 		j=$(($j+1))
> > 	done
> > 	i=$(($i+1))
> > done
>
> Thanks very much.
> What if we wanted  to tke the variables i and j
> from a file.

That would depend what format the file was. At the simplest level, with
two files called "current_i" and "current_j", containing the numbers
alone, you can read that like so:

i=$(cat current_i)
j=$(cat current_j)

and then proceed as normal. If the file contains something like

i=5
j=18

you could probably do

eval $(cat name_of_the_file)

to get those variables as shell variables. If the file contains any more,
you'll have to get something smarter to read it, and I'd recommend using
Perl if you go much more complex.

-- 
Ben Smithurst
ben@scientia.demon.co.uk

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