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

[Ryan Castellucci]

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On Wednesday 08 October 2003 11:49 pm, dylan wrote:
> hi-
>
> been playing around with using a basic stamp II to collect environmenta=
l
> 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 b=
y
> 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 value=
s. 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 pip=
e)
>
> 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?

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cut -d '|' -f 2

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