usage: rspan interval file [arguments ...]
rspan is a randomized time span creator, a program that upon execution creates a random timeout based on given interval. When the timeout ends, the given file will get executed with potentially given arguments.
Edit config.mk to match your local setup (rspan is installed into the /usr/local namespace by default), then simply enter the following command to install (if necessary as root):
Example usage of rspan
One common usage area of rspan is together with the crontab
get source here.