OK - i figured it out:
on the linux/unix command line type:
crontab -e (e for edit)
this will open the document in VI.
now you set the task time using the following format seperated by spacing. For example if I wanted to run a particular file every minute I would add the line:
* /home/my_username/cronfile.txt
minutes (0-59)
hour (0-23)
day of the month (1-31)
month of the year (1-12)
day of the week (0-6, 0=Sunday)
a star is all possible values so the above line would execute the file every minute of every hour of every day of every month of every day of week.
You can execute a PHP file but I think that you have to have a CGI install so I'm just going to use Perl for my task.
Gook luck.
