#!/bin/sh
    
### This script will be executed by cron. This should be a
### very portable script.

### Usage: ./sigselect [Sleep] [Directory]
### where [Sleep] is time (in seconds) that the script will
### sleep between signature changes, and [Directory] is the 
### directory that stores the signature files.

### The signature files in [Directory] should be named sequentially,
### with numerals and no leading zeroes (e.g. 1, 2, 3, 4, ...)

###    DzM - 5/28/99
###    rev 0.1 5/28/99 Initial creation
###    rev 0.2 6/23/99 Cleaning up
###    rev 0.3 6/18/01 Made script more interactive
###                    Rather than require script to run through cron,
###                    it now takes command line options and sleeps
###    rev 0.4 6/20/01 Added some error handling that prevents the
###                    script from running if no preferences are provided
###    rev 0.4.1 7/30/01 Changed the calculation used to determine number
###                      of files

sleep_time=$1
sig_dir=$2
loop="true"

cd ${sig_dir}
    
if [ ${sleep_time} -a ${sig_dir} ]
then
 while [ $loop = "true" ]
 do
   files=`ls -1 | wc -l | awk '{print $1}'`

   file=`expr $RANDOM % $files`
   file=`expr $file + 1`

   cp $file $HOME/.signature

   sleep ${sleep_time}
 done
else
 exit 1
fi