[vox-tech] bash question - how to read specifed amnt of data from a file

[vox-tech@lists.lugod.org]

hi dylan,

please don't start a new thread by replying to a message.  always
compose a new message.  you broke the keymapping thread for me.

i've noticed that outlook users are particular prone to starting threads
by replying ot old messages.  i'm curious -- in outlook, is it easier to
reply than to start a new message?

pete

ps- there's a header "In-Reply-To:".  if you delete that header, you'll
be fine.



On Wed 08 Oct 03, 10:49 PM, dylan <dylan@iici.no-ip.org> said:
> hi-
> 
> been playing around with using a basic stamp II to collect environmental
> data with very minimal setup (CdS cell and capacitor form an RC network, RC
> constant is measured by BS II)
> [http://surfdavis.no-ip.com/~dylan/light_level.p2.png]
> 
> the BSII sends its data to /dev/ttyS0, and it is read in with the
> command'cat /dev/ttyS0 > tmp.light &' . data is parsed by a simple awk
> script and then sent to ploticus for a nice plot. the plot is updated by
> running a shell script that runs the awk sript and then ploticus.
> 
> this works, but there is no way to associate a time with the data values. i
> was thinking that if there was some way to have a bash script read from
> /dev/ttyS0 every 10 seconds or so, save the value to a text file along with
> a date stamp it would be pretty neat.
> 
> the output from the BSII looks something like this:
> light_level|light_level|light_level   and so on (the delimiter is a pipe)
> 
> now to the question: does anyone know how to make bash read from a file
> (i.e. the serial port) from one pipe until another pipe, and then save the
> value in between to a text file?
> 
> i know this is asking a lot, but any pointers would be great!
> 
> thanks a lot!
> 
> dylan
> 
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