[aklug] Re: linux bash backgrounding and I/O redirection

I love me some timeout.

On Wed, Jul 25, 2012 at 2:46 PM, techno curmudgeon
<technocurmudgeon@gmail.com> wrote:
> The solution to my particular programming problem is to use 'timeout'
> instead of the 'background/sleep/kill' loop I was using. Thanks to
> Jeremy Austin.
>
> More fundamentally, as near as I can tell from google and man and
> superuser and such, the stdio system only flushes on exit from the
> calling shell, instead of every x seconds. This is a 'feature'. So
> when the backgrounded process was killed, no data got flushed to disk.
> (as an aside, this actually doesn't seem right to me, so either I'm
> not understanding what I'm reading, or my instincts for what's 'right'
> is wrong. There is precedent for both 8) )
>
> Regarding inserting into a database, I like that. In fact, chances
> are I'm going to have to do something similar to this exercise for
> some different sensors sometime later this year. I'll probably take
> the database approach for that.
>
> Thanks to all.
>
> Here's the current, working bash script:
>
> ------------------------------
>
> #!/bin/bash
> DEST=/home/sensors/gps1
> [[ -d $DEST ]] || mkdir -p $DEST
>
> while true
>
> do
>
> DESTFILE=$DEST/"gps1-freq-ref-capture-"`date +"%Y-%m-%d-%H%M"`
>
> timeout 600 nc fepts03 20014 > $DESTFILE
>
>
> done
> ---------
> To unsubscribe, send email to <aklug-request@aklug.org>
> with 'unsubscribe' in the message body.
>
---------
To unsubscribe, send email to <aklug-request@aklug.org>
with 'unsubscribe' in the message body.
Received on Wed Jul 25 16:57:47 2012