file picker

Joshua Oreman oremanj at
Thu Aug 21 09:59:10 PDT 2003

On Thu, Aug 21, 2003 at 11:36:24AM -0500 or thereabouts, Walter wrote:
> Hi All,
>    I want to run a cron job to upload a different image
> file to a web site as a new background every night.
>    I need a way to automatically select a different file
> from a directory which I will populate over time, and
> then feed that name to the upload script.  I can't find
> anything like this in the ports.  Can someone suggest
> a utility, script, et cetera, for this?  Otherwise, I'm
> prepared to write my own, but I don't want to re-invent
> the wheel, as the saying goes.  Thanks.

To select a random file from the directory, try this:-

DIR=<<< the directory >>>
nfiles=$(ls -1 $DIR | wc -l | tr -d ' ')
fileno=$(( ($RANDOM % $nfiles) + 1 ))
FILE=$DIR/$(ls -1 $DIR | head -n $fileno | tail -n 1)

# $FILE now contains the full pathname of the file to
# upload. I'm sure you can handle the upload task :-)
# Note: this script may re-use the same file later. To
# prevent this, add a line below the upload:
#  mv $FILE /somewhere/else/
# That way the directory will only contain unused files.

-- Josh

>    Please CC me as I'm not currently subscribed to the
> List.
> Walter
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