[ILUG] Bash script - technical question

[David Pintor]

Hi,

Thanks for your responses... :-)

Just in case anyone's interested, I found a more or less nice way to do
this, using a file that stores the seconds and using both sleep and the
crontab...

Basically:

if interval >= 1 min
   sleep ` cat secs.txt`
   get info > logfile
   next_date=`date +interval`
   echo "next_date * script" > crontab
   get seconds from next date > secs.txt
else # less than 1 minute
   if this is the first time i run the script
       put entry in the crontab for next minute # it will take a few secs to
start
   else
       while true
           sleep secs
           get info > logfile
       done
    fi
 fi


Regards,

David


On 29 October 2010 18:04, Brian Foster <blf at utvinternet.ie> wrote:

>  > Date: Fri, 29 Oct 2010 12:24:23 +0100
>  > From: Pádraig Brady <P at draigBrady.com>
>  >[ ... ]
>   > Note sleep on linux supports hours etc. like:
>  >
>  >   wait=1:2:3
>  >   sleep $(echo $wait | sed 's/\([^:]*\):\([^:]*\):\(.*\)/\1h \2m \3s/')
>
>  Heh.  I'd just do:
>
>    wait=1:2:3
>    sleep $( IFS=:; set -- $wait; echo $1h $2m $3s )
>
>  Above assumes $wait always has the three ‘:’-separated fields
>  HH, MM, and SS.  If an issue, it's easily modified to handle
>  missing/empty fields:
>
>    sleep $( IFS=:; set -- $wait; echo ${1:-0}h ${2:-0}m ${3:-0}s )
>
>  And you don't _need_ the GNU/Linux sleep(1) feature being used,
>  you could just compute the number of seconds....  but that's a
>  different (and probably not relevant) observation.
>
> cheers!
>        -blf-
> --
> “How many surrealists does it take to    |  Brian Foster
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